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Illustrations and extensive description of the items listed below can be seen in Dennis Laney's definitive Leica 1984 Accessory Guide courtesy of Mike Butkus

Leica Code	Description	Production Year	Remarks
NAKUL	Film viewer with magnifier and indicator punch; with handle; the 250 version has side cups to handle a long strip of film	1936-19??	-
NAMAS	Opal glass to fit behind the film in a film viewer	1930's	-
NATRA	Film viewer with magnifier and indicator punch; without handle	1932-19??	-
NOKUM	Close focus accessory with parallax for Summar f= 5 cm 1:2 lens (formerly NOOKY-HESUM)	1960-19??	16505
NOOBU	Film viewer without indicator punch	1951-19??	-
NOOKY	Close focus accessory with parallax for Elmar (I) f= 5 cm 1:3.5 lens	1935-19??	16500
NOOKY-HESUM	Close focus accessory with parallax for Hektor f= 5 cm 1:2.5 or Summar f= 5 cm 1:2 lens	ca.1935-1959	-
			-
OAGNO	Medical copy stand using PLOOT	1938-19??	-
OAPDO	Medical copy stand using PLOOT	1939-19??	Italian item
OCEGO	Leica Ig body	1957-1963	-
OCLOM	Visoflex II with 4x 90 magnifier, bayonet mount	1962-19??	-
ODULO	PROON reflex housing + PAMOO right-angle magnifier	1940-19??	-
OEFGO	Leica If body	1952-1957	-
OEGIO	Leica If with viewfinder for 50 mm lenses; Leica Ic in 1950 NY catalog	1952-1957	-
OEINO	Leica If with viewfinder for 50 mm lenses and ELMAR	1952-1957	-
OEUPO	Extension ring for Summicron (II) f= 9 cm 1:2 with !:4.5 reproduction ratio	1959-19??	16474
OHEBO-M		19??-19??	-
OHIKO	Stereo unit complete with Stemar lens OISBO, prism, and viewfinder for screw-mount cameras	1954-1957	-
OHIKO-M	Stereo unit complete with Stemar lens OISBO, prism, and viewfinder for M-mount cameras	1950's	-
OHTEO	OIPVO stereo viewer + OIFCO light unit	1950's	-
OHUGO	No. 1 light yellow filter; paired for Stemar mount	ca.1959	NY item
OHVIO	Orange filter; paired for Stemar mount	ca.1959	NY item
OHWLO	UVa filter; paired for Stemar mount	ca.1959	NY item
OIASO	Sremar stero lens for M-camera	1954-1957	-
OIDYO	Cylidrical chrome, half frame viewfinder used with Stemar stereo unit similar in shape to SBOOI	1950's	-
OIFCO	Stereo light unit	1950's	-
OIGEO	Stereo lens hood for use on Stemar when prism is not attached	1950's	-
OIMPO	Prism for front of Stemar for subject distances beyond 10 feet; hinged front cover added in 1955	1950's	-
OIPVO	Stereo viewer with independently focusing eye pieces; brittle plastic housing	1950's	-
OIRZO-M	Stereo unit complete with Stemar lens OIGEO, prism, and viewfinder for M-mount cameras	1950's	-
OIRZO-S	Stereo unit complete with Stemar lens OIGEO, prism, and viewfinder for screw-mount cameras	1950's	-
OISBO	Stemar stereo lens	1950's	-
OIVHO	Rear cover for bayonet-mount Stemar	1950's	-
OIWKO	Lens cap with bayonet for Stemar	1950's	-
OIXMO	Rear cover for screw-mount Stemar	1950's	-
OIZQO	Rear cover for Stemar prism	1950's	-
OKARO	Orange filter to improve contrast between rangefinder images for FOKUS or Leica IIc, IIf, IIIb, IIIc and IIIf in chrome	1939-1962	14058
OKBZO	Diopter correction lens for near-sightedness for Leica IIIg	1960-19??	14064
OKLMO	Connecting piece to convert Focomat Ic enlarger to copy use with column VOOQF and arm OKYNO	1956-19??	16744
OKVCO	Diopter correction lens for astigmatism for Leica IIIg	1960-19??	14066
OKYNO	Arm for Focoslide Valloy II enlarger	1956-19??	16748
OKZPO	Copy stand 25 1/2 inch column with guide rail	19??-19??	16747
OLEYO	Single exposure camera with IBSOR shutter used with Elmar 3.5, 5, and 10.5 cm lenses	1934-1935	[1]
OLIGO	Single exposure camera with Ibsor shutter used a variety of lenses	1934-1939	[2]
OLLUX	Hood for 35mm f/1.4 Summilux I	1961-19??	-
OLORA	Single exposure camera without shutter	1936-19??	NY item
OMAPO	Close focus accessory with parallax for 50 mm 1:4 lens; per Lager: catalog item only, no known examples are known	1939	-
OMEXO	Complete copy stand including OOZEG, OOZAB, ZOOXY, VALOO, LVFOO, KGOON, OPKOM, ROOYH and ONLIO	1951-19??	-
OMIFO	Close focus accessory with parallax for Elmar (III) 1:4 / 90mm lens	1949-19??	-
ONLIO	Canvas carrying bag portion of OMEXO for Focoslide	1951-19??	-
OOBAZ	Late version focusing stage known as Focoslide for Screw-thread cameras using N series helical focusing lenses and extension tubes	1958-19??	16607
OOEUK	16 x 14 1/2 inch light box with 4 lamps	1951-19??	16763
OOEVM	9 1/2 x 7 inch light box with 4 lamps	1951-19??	16763
OOFRC	Remote shutter release and winder operated by two chords	1936-19??	-
OOGAN	OOBAZ Focoslide + VXZOO + VTOOX for Elmar f= 5 cm 1:2.8	1958-19??	16632, 16603-3/8" bush
OOGIT	OOBAZ Focoslide + VXOOT + VALOO for Elmar (III) f= 5 cm 1:3.5	1958-19??	16633, 16604-3/8" bush
OOGUM	OOBAZ Focoslide + ZOGOO for Focotar	1958-19??	16634, 16612-3/8" bush
OOMAP	OOTGU Focoslide + ZOGOO for Focotar	1956-19??	16682, 16674-3/8" bush
OOMEX	OOTGU Focoslide + VXZOO + VTOOX for Elmar f= 5 cm 1:2.8	1958-19??	16633, 16604-3/8" bush
OOMYL	OOTGU Focoslide + VSPOO + VTROO for Summicron	1956-19??	16681, 16678-3/8" bush
OORES	Rotating focusing mount with screen; early versions with single lens; 1937 double; slide-in and bayonet versions	1934-1950's	-
OOTGU	Late version focusing stage known as Focoslide for M-cameras using N series helical focusing lenses and extension tubes	1957-19??	16680
OOZAB	Focusing stage known as Focoslide; early version had single bar on spring-loaded arm; later version with adjustable positioning bar; last version was H-shaped to clear flash bracket lug	1938-1957	-
OOZAB-G	Focusing stage known as Focoslide for accepting Leica IIIg camera	1951-1957	-
OOZEG	Folding horse-shoe type copy stand portion of OMEXO for Focoslide	1951-19??	-
OOZIS	Collapsible, horseshoe shaped copy stand	1939-19??	-
OOZKU	Set of 5 extension rings for OOZIS copy stand	1939-19??	-
OOZMY	Complete copy outfit including OOZAB, ZOOXY, ROOYH, VALOO, LVFOO and OPKOM release	1952-19??	-
OPDUR	Medical copy stand using OPRAL and OPFAS	19??-19??	-
OPFAS	Medical copy stand using frame with handle and chest support	1932-19??	-
OPKOM	Cable release portion of OMEXO for Focoslide; 20 inches with lock	1951-19??	-
OPRTO	Diopter correction lens for near-sightedness for Leica IIc, IIf, IIIb, IIIc and IIIf	1951-19??	14060
OPRYL	Medical copy stand using lower body strut with webbing sling	19??-19??	-
OPSVO	Diopter correction lens for astigmatism for Leica IIc, IIf, IIIb, IIIc and IIIf	1951-19??	14065
OQZIO	Diopter correction lens for near-sightedness for Viso magnifiers LVFOO and PEGOO	1960-19??	14063
ORAKO	Orange filter to improve contrast between rangefinder images for FOKUS or Leica II, III and IIIa in black or chrome	1936-1962	14057
ORBMO	Diopter correction lens for near-sightedness for Leica I-IIIa and Universal viewfinder	1941-19??	NY item
ORLEO	Diopter correction lens for astigmatism for Leica M-cameras to 1977	1956-1977	14062
ORESO	SPOOV copy stand + OORES rotating stage	1936-19??	-
ORMGO	Diopter correction lens for astigmatism for Leica I-IIIa and Universal viewfinder	1941-19??	NY item
OROLF	Lens turret for 3 lenses with handle; no more than 250 were made	1960	-
ORQPO	Hood for Summarex f= 8.5 cm 1:1.5; early version was black with clamping screw, later chrome for bayonet fitting	1951-1960	12525
ORTOX	Diopter correction lens for near-sightedness for Leica M-cameras to 1977	1951-1977	-
ORTUX	Diopter correction lens for near-sightedness for Leica I-IIIa and Universal viewfinder	1933-19??	14061
ORTVO	Cap that screws into body lens opening	19??-19??	14055
ORUXO	Diopter correction lens for astigmatism for Leica I-IIIa and Universal viewfinder	1938-19??	14069
ORWYB	Diopter correction lens for near-sightedness for Leica IIIb	1939-19??	NY item
ORYCE	Diopter correction lens for astigmatism for Leica IIIb	1939-19??	NY item
ORYFO	Rear dust cap for screw lenses	1951-19??	14050
OSBLO	Magnifying eye-piece for 5 or 9 cm screw lens; converts lens to small telescope	1954-19??	-
OSERO	Diopter correction lens for astigmatism for Viso magnifiers LVFOO and PEGOO	1960-19??	14069
OTDYM	Visoflex II without magnifier, bayonet mount	1962-19??	16455
OTEMO	Stemar attachment for subject distance of 3 - 10 meters; only 20 of these were delivered	1950's	-
OTPLO	Telyt 20 cm 1:4.5 for Visoflex	19??-19??	-
OTPRO	1:1.25 magnification accessory for OTZFO focusing mount used with Visoflez II/ III	?	16471
OTQNO	Visoflex ring addapter for Elmar 9 cm	1959-19??	16468
OTRPO	Visoflex extension tube for near focusing with universal focusing mount	1959-19??	16471
OTSRO	Adapter for use of 13.5 cm Hector lens with OTZFO focusing mount used with Visoflex II/ III	1959-19??	16472
OTVXO	5x chimney eyepiece for Visoflex II	1962-19??	16461
OTXBO	4x 90 degree eyepiece for Visoflex II	1962-19??	16461
OTYDO	Visoflex II without magnifier, screw mount	1962-19??	16457
OTZFO	Focusing mount for Visoflex II/ III for use with 65mm Elmar, 90mm Elmarit and 135mm Elmar lenses	?	16464
OUAGO	Visoflex addapter for using Elmar 9 cm	1959-19??	16467
OUBIO	Visoflex II/ III adapter for Hektor 125 mm; Elmar and Hektor 135 mm in short mounts; TELYT Visoflex lenses	1959-19??	16466
OUCLOO	Visoflex II with 4x 90 magnifier, screw mount	1962-19??	16458
OUEPO	Close-focus adaptor to be used with either the Summicron (II) f= 9 cm 1:2 in ZOOEP/16463 or 16462 adaptor or the 2.8/135 in 16462 adaptor. This usage will yield a 1:4.5 reproduction scale.	1959-19??	16474
OUFRO	Extension ring for 35/50mm M-bayonet lenses with 1:1 ratio	?	16469
OUFRO	Visoflex extension ring for 5 and 3.5 cm lenses	1959-19??	16469
OUTSO	Projection head to fit ground glass screen of Focoslide or Reprovit	1951-19??	16750
OVAFO	Base and 48 x 1 5/8" diameter column for Reprovit I	1951-19??	-
OVURO	Valoy II copy stand with 32 inch column and UWOOS bracket for Focoslide	1960-19??	16701
OZTNO	Cable release addaptor for using screw release on M-camera	1955-19??	14088
OZTOM	Double cable release for M-camera	19??-19??	16491
OZUPO	Visoflex I housing - JCB's Visoflex I Collection	1951-19??	16484
OZWTO	Double cable release for Visoflex I with time lock screw; early chrome and later black versions	1951-19??	16492
OZWTO-M	Double cable release for Visoflex M-camera with time lock screw; early chrome and later black versions	1951-19??	16491
OZXOM	Visoflex I with 5x chimney eyepiece, bayonet mount	19??-19??	16482
OZXVO	Cable release for Visoflex I for screw cameras only; pneumatic so called "sports release"	1954-19??	16493
OZYXO	Visoflex I with 5x chimney eyepiece, screw mount	19??-19??	16485
OZYXO-M		19??-19??