Yes Eric I did miss the point a bit. I was just saying that I wouldn't be worried about SN's matching the BN's as long as the SN looked clean and authentic, but no that wasn't the point. !!
I have had some experience with stolen bikes/altered SN's, and I was just saying that I'm convinced the SN's on my big twin 74 are real, really an almost "textbook" example of good numbers and a unmolested SN boss, but I wouldn't have any idea if they were stamped on replacement cases at the factory, stamped at a dealer, or just how the cases were replaced and stamped. So no, I don't know, and yes I did miss the point. !!
Ken, thanks for the response and I hope you didn’t take offence. I agree it isn’t a worry for the SN to match the BNs as long as everything looks authentic.
Good to hear the number boss on your BT 74 is unmolested but I don’t know how you’re convinced the SN is real
if you have no idea who stamped it, and given the different model possibilities I mentioned above. Because you said your SN is an almost "textbook"
example of good numbers will I assume you mean it consists of characters used by the factory for 1937 models? If so then there’s the question of whether said characters were early-37 H-D styles or later-37 H-D styles, along with the possibility of exceptions to that apparent early vs later rule.
If your SN is almost textbook to the point that all characters appear to be either early-37 H-D or later-37 H-D depending on SN, then I’d say there’s a fair chance it was applied on replacement 1941 cases by Harley, either at a dealership or at the factory.