Yes, i understand that this is a logical step assuming there is a VIN number... But it doesn't seem to be the case for me.
I can't find this code anywhere on the frame.
I don't now if it helps at all, but i bought this bike from a guy in Lithuania. He bought this bike from a friend in Latvia.
That's as much as i know about the history of the bike.
The previous owner told me that he guesses that it is a Rudi Altig Schwinn frame... But i couldn't find anything by following this "lead".
Maybe it helps you in some way.