Ivar, I found these two sold in Vienna at Westlicht Auction in May 2005 : can be a good reference ; note the second has hood, while the first no... and none of them had the original box (it would have been surely quoted if present). If you really wish to sell it... wait, but get a RIGHT PRICE... is a rare and very collectible item.
Nocti1_Westlicht.jpg
Noctilux 1.2/50mm with aspheric lenses, a few faint scratches on the lenses - otherwise in mint condition, case, cap
Condition: A-
Year: 1968
Serial no. 2255176
EUR 1.600 (Start price)
EUR 2.520 (Hammer price incl. premium)
Nocti2_Westlicht.jpg
LOT 172
Noctilux 1.2/50mm
the famous 6-element Noctilux 1.2 with aspheric lenses, in very good condition, original hood 12503, both caps
Condition: B/A
Year: 1973
Serial no. 2556731
EUR 2.000 (Start price)
EUR 3.840 (Hammer price incl. premium)