Hi Frank,Lucky you. Only some 4 900 copies were made of the S-series. Yours is among the lowest SN. They probably started at a low 155 xxx.
Going through a box and found a Black S, SN:1559##, only issue seems to be with the shutter. other wise the camera is is great shape.
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!