Thanks to each of you for the thoughts.
The seller was using Scott, so it came to me as Sc#37. If I didn't have any additional information, I'd be perfectly happy to tuck it away as that and call it a day.
If I can get to Chicagopex this weekend, I'll bring it along and see if a dealer or two might hazard a guess (or maybe have all three on hand).
I've got my fingers crossed that you're right, tonymacg.

Since I'm not parting with it, I have no pressing need to send it off for confirmation, but I'd still like to have some degree of confidence that I know what I have.
Any other opinions are gratefully accepted...