Back then on all of the frmes I have seen,and checked #'s on the stamping process wasnt the best ad left more of a very deep dent in the frame more so than the #'s,it also was a perfect place for water salt ,and othe rust producing items to settle and eat away at the lightly stamped #.

FRAME AND SERIAL # SHOULD BE SAME .FRAME SERIAL # SHOULD BE STAMPED ON TOP OF LEFT RAIL UNDER FRONT SEAT AND UNDER WHERE REAR SEAT LEHT SIDE PAASSENGERS FEET WOULD BE.VERY HAED TO FIND IF FRAME HAS RUST ON IT.OR WITH BODY ON.