cjm
Well-known
I have a type 2 black rigid 50mm Summicron and the serial number on front of the barrel is 2270218. I just noticed that if I focus as close as possible, the barrel extends and reveals another number etched in the side of the barrel. That number is 2796221. Any idea what this second number is?
ben lloyd
Established
Can you post a picture of it?
My first thought is it might be someone's social security number, or an inventory number for a business.
My first thought is it might be someone's social security number, or an inventory number for a business.
venchka
Veteran
Not enough numbers for Social Security. Drivers licenses maybe. OR, you have a lens head and focusing mount mis-match. Does the lens head unscrew from the mount? DR Summicrons have a lens head which unscrews from the focusing mount. Both pieces left the factory with the same serial number. That assures that the lens and mount match.
cjm
Well-known
trittium
Well-known
looks like a phone number
M
Magus
Guest
Post deleted by posters request
venchka
Veteran
Ah yes. A picture is worth a thousand words. That would be what KEH calls "engraved". I did the same thing to my very nice Canon SLR gear back in the '70s. Dumb! It doesn't hurt the pictures for sure!