I have a vocal Bill Miranda camera lens number 620-929 it's the kind like you crank and it folds out like the old kind of camera lens with accordion style look
The SB2 was a part of the S3-series, of which some 360 000 were made. Yours and mine differ with 98000, so not unlikely. Where did you pick it up? Good luck!
I recently picked up an SB and SB2. The SB serial no is close to yours 283235, but the SB2 is very different 500805. Do you know why they would differ so much?
Thank you, David!