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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
SAIOO	Folding type "Sports" viewfinder for Hektor f= 7.3 cm 1:1.9 lens	1935-19??	-
SAMWO	F = 3.5 cm 1:2 Summicron I for M3	1958-1969	11 108
SAWOM	35mm f/2 Summicron II for M2	1958-1969	11 308
SAWOO	Summicron (I) f= 3.5 cm 1:2	1958-1963	11 008
SBKOO	Enclosed chrome, flared cone viewfinder for 21 mm with parallax adjustment by concentric ring like SGVOO ; later versions are black	ca.1960	12002
SBLOO	Finder for Summaron f= 3.5 cm 1:3.5	ca.1951-1960	12010
SBOOI	Enclosed, cylindrical viewfinder for 5 cm lenses JCB's a little...Ig	ca.1951-1960	12015 JCB's a little...Ic
SCNOO	Rapid winder for Leica IIIa (model G), Leica IIIb	ca.1937	JCB's a little...IIIa
SDOOG	Tripod head with spring catch for rapidly fixing camera to tripod	1936-1949	-
SDPOO	Close-focus attachment with "eyes" for F = 5 cm 1:2 Summicron II	1956-1968	- Forum discussion
SELAN	Angle bracket to enable vertical flash unit	ca.1947	-
SELBA	Battery case for SELIS or SELBA flash units	1947-19??	-
SELCA	14 inch flex cable for vertical flash unit	ca.1947	-
SELEX	10 foot flash cable for remote flash unit	1947-19??	-
SELIS	Horizontal flash unit with delay slider for Leica IIc and Leica IIIc	1947-19??	-
SELLO	6 foot flash cable for remote flash unit	1947-19??	-
SELOR	Three-way flash socket to attach leads to a synchronizer	19??-19??	-
SELSY	Horizontal flash unit with delay slider for Leica cameras above sn. 111450 except Leica IIc and Leica IIIc per SELIS	1947-19??	-
SEOOF	Summicron (I) f= 9 cm 1:2	1959-1962
SEOOF-M	Summicron (I) f= 9 cm 1:2 Forum discussion		made in Canada only
SEOOM	Summicron (II) f= 9 cm 1:2 Forum discussion	1959-1979	-
SEROO	Folding chrome or black (rare) viewfinder for 9 cm with parallax	1935-19??	JCB's...a little III
SEVUE	Fixed cradle type, chrome & black viewfinder for 9 cm with paralax	1949-19??	NY item
SFTOO	Mini-telescope viewfinder for 20 cm; black tapered rectangle	1938-19??	12035, 12034- metric version
SGOOD	Enclosed chrome, flared cone viewfinder for 85 mm with parallax adjustment by concentric ring like SGVOO	1951-19??	12020
SGVOO	90mm viewfinder/bright finder	1951-?	12025
SHADE	Replacement hood for Thambar f= 9 cm 1:2.2	1939-19??	-
SHOLD	Shoulder pad for a camera neck strap	1950-19??	NY item
SHOOC	Enclosed chrome, flared cone viewfinder for 135 mm with parallax adjustment by concentric ring like SGVOO	1951-19??	12030
SHOOE	Black, rangefinder accessory clip	1949-1951	66260 NY item
SHUUC	Mirror for the "Leitz Betrachtungskasten" Projector Fontenelle archive	1937-??	-
SHXOO	13.8 mm shutter speed dial supplied free of charge for Leica's with a different sized dial	19??-19??	-
SIMOM	Summaron f= 3.5 cm 1:2.8 for M2	1958-1974	11306 Y
SIMOO	Summaron f= 3.5 cm 1:2.8 screw-mount	1958-1963	11106 P
SIMWO	Summaron f= 3.5 cm 1:2.8 for M3 boxed with "specs" and caps	1958-1974	11106 Q
SIUUB-Glas	Parvo 100 / Prado 100 projector with Hektor 2.5/8.5cm	1949-1950	-
SIZOO	Folding viewfinder for 10.5 cm	1935	-
SLOOZ	Viewfinder, 28 mm, black or chrome	1960-?	12007
SMUUY	Parvo 100 / Prado 100 projector with condenser I (f. 7.3-10cm)	1949/ 1950	-
SMYOM	Rapid winder known as Leicavit-MP for M1, M2 and MD	1960-1966	14008, 14018-with 3/8" bush
SNHOO	Adaptor for using Summicron 42 mm E39 filters on Summitar [1] [2] [3]	1957-19??	13078 Fontenelle archive
SNOOX	Summaron f= 2.8 cm 1:5.6	1955-1963	-
SOMKY	Close focus accessory for collapsible version of the Summicron or Elmar 50mm lens, and with the front element of the fixed Summicron with the use of an adapter called UOORF	1956	also called SOMKY-M
SOMKY-UOORF	Close focus accessory for non-collapsible version of the Summicron with the use of an adapter called UOORF Forum discussion	19??-19??	16509
SOMNI	Summicron (I) f= 5 cm 1:2	1956-1968	11918
SOMWO	M3 fitting with "eyes" for Summaron f= 3.5 cm 1:3.5	1958-19??	JCB's a little...M3
SOOAW	Fixed cradle type, chrome & black viewfinder for Hektor f= 7.3 cm 1:1.9 with or without parallax adjustment	1943-19??	Lager doubts SOOAW was produced commercially
SOOBK	Hood for Summaron f= 2.8 cm 1:5.6	ca.1955-1963	-
SOOCX	Summarex f= 8.5 cm 1:1.5	1948-1960	-
SOODL	Viewfinder, 50 mm	ca.1949	Lager doubts SOODL was produced commercially
SOOEY	Adaptor for use of Summitar type L filters on 42 mm lens with E39 filter thread Forum discussion Fontenelle archive	1957-19??	13077
SOOFM	Collapsible hood for 5 cm Summicron	1954-19??	Forum discussion
SOOGZ	Adaptor for ADVOO with lenses of 36 mm diameter; also for use of Summicron 42 mm, E39 filters on A36, 36 mm Forum discussion	1955-19??	13154 Fontenelle archive
SOOHN	Hood for Hektor f= 2.8 cm 1:6.3	ca.1935-1955	-
SOOIA	Summarit f= 5 cm 1:1.5	1949-1960	-
SOOIA-M	Summarit f= 5 cm 1:1.5	1952-?
SOOIC	Summicron (I) f= 5 cm 1:2	1953-1960	-
SOOIC-M	Summicron (I) f= 5 cm 1:2	1954-1960	-
SOOKY	Close focus accessory for rangefinder Elmar 5c lens with parallax	1954-19??	-
SOOKY-M	Close focus accessory for M-series Summicron or Elmar 5c lens with parallax; later called SOMKY	1956-19??	16507
SOOLB	85 mm "sport" viewfinder	1959-1961	66155
SOOME	Summilux (I) f= 5 cm 1:1.4	1959-1961	-
SOOMP	Hood for Summar f= 5 cm 1:2	1936	Wetzlar & NY versions
SOONC	Summaron f= 3.5 cm 1:3.5	1948-1960	-
SOONC-M	Summaron f= 3.5 cm 1:3.5	1956-1960	-
SOONC-MW	Summaron f= 3.5 cm 1:3.5 with viewfinder for the M3	1956-1960	JCB's a little...M3
SOONC-MT	Summaron f= 3.5 cm 1:3.5 with viewfinder for the M2	1957-1960	-
SOOPD	Collapsible hood for 5 cm Summitar JCB's a little...IIIb	1949-19??	Forum discussion
SOOQR	Adaptor for use of Summitar type L filters on 42 mm lenses Fontenelle archive	1954-1956	Forum discussion
SOORE	Summitar f= 5 cm 1:2	1939-1955	-
SOORE-B	Coated Summitar f= 5 cm 1:2	1946-1955	-
SOOTF	Adaptor to use screw-in filters for 5 cm Summitar on A36 Elmar 9cm Fontenelle archive	1939-1955	13079
SOOUT	Cradle type viewfinder for 90 mm lens	1943-1949	JCB's a little...Ic
SOOUV	Fixed cradle type, chrome & black viewfinder for 9 cm with or without parallax adjustment	1943-19??	-
SOOYV	Fixed cradle type, chrome & black viewfinder for 13.5 cm with or without parallax adjustment	1943-19??	-
SOOZI	Summicron (I) f= 9 cm 1:2	1957-1959	-
SOREI	Shutter release, soft, improved type; flared chrome cylinder	1949-19??	NY item
SOSIC	Summicron (I) f= 5 cm 1:2	1956-1968	-
SPECS	Polaroid spectacles for stereo viewing	1930's	-
SPMOO	Copy stand special large base	1938-19??	-
SPOOM	Spare film take-up spool	1955-19??	14022
SPOOV	Horseshoe copy stand for rotating OORES with white board for specimin	1936-19??	-
SPUCA	Spare film center cassette spool	ca.1953	14015
SPULM	Spare film take-up spool	1931-1953	-
SQTOO	Mini-telescope viewfinder for 40 cm; black tapered rectangle	1938-19??	12037, 12036- metric version
STAFO	Four lamp, large copy stand array on column mounted crossbar	1933-19??	-
STALI	Two lamp, small copy stand array on column mounted crossbar	1931-19??	-
STAMA	Steel tape measure plumb-bob for copy stand	1933-19??	-
STAOT	STARE copy stand + FLOTH plumb-bob	1930's	-
STARE	Open base, collapsible copy stand with canvas carrying bag	1931-19??	Forum discussion
STEFLA	Kodachrome flash filter; paired for Stemar	ca.1949-	NY item
STEKOA	Kodachrome type A filter; paired for Stemar	ca.1949-	NY item
STEKPF	Kodachrome photoflood filter; paired for Stemar	ca.1949-	NY item
STERO	Stereoly camera attachment for Leica IIIb for taking stereo photgraphs	1939-19??	NY item
STOOR	Four lamp, universal copy stand array on paired U-shaped sidebars	1933-19??	-
STUOO	Steel tape measure; part of REROD	1936-19??	-
STYYX	Four lamp, small copy stand array on paired sidebars for 1 1/4" column	1939-19??	NY item
SUMAN	MICRO Summar 24mmm f /4.5 Forum discussion	1930s-1950s	-
SUMAR	Summar f= 5 cm 1:2 (SUMUS in 1933 catalog)	1933-1940	-
SUNGO	Replacement hood for F = 20 cm 1:4.5 Telyt with clamping ring and set screw. Superseded by TNGOO	1939-1950	NY item
SUOON	Super-Angulon f= 2.1 cm 1:4	1958-1963	-
SUOOQ	Black or chrome folding viewfinder for Hektor f= 2.8 cm 1:6.3	1934-19??	-
SUUHN	Parvo 100 / Prado 100 projector with condenser II (f. 5cm Summar/ Sumwithar)	1949-1950	-
SUUAI	Parvo 100 / Prado 100 projector with condenser III (f. 5cm Elmar/ Summar)	1949-1950	-
SUUZI	Film strip holder for projectors	1952	-
SUWOO	Mini-telescope viewfinder for single film housing; like the Leica Standard finder	1925-1935	-
SVOOP	Spare take-up film spool for all cameras prior to Leica IIIg	1954-19??	14021
SYBAT	Flash battery case extension to enable 3 cells to be used	19??-19??	-
SYEOO	Folding "Sports" viewfinder for Hektor f= 13.5 cm 1:4.5 or Elmar f= 13.5 cm 1:4.5	1935-19??	JCB's a little...III
SYNCO	Horizontal flash unit with sync-head for connecting to the base plate of Leica II, III, IIIa and IIIb	1938-19??	NY item
SYOOM	Rapid winder for Leica IIIf or Leica IIIg	ca.1953	-
SYOOM-M	Rapid winder for MP and MP2 or M2	ca.1957	JCB's a little...M2