Many thanks for the help, gentlemen. I know (or at least was told) my boat was purchased from the original owner last year, who kept it in a barn in GA since new. The title had to be transferred to FL, so it got new FL numbers last year.
I've done some digging and found this list of USCG registered HIN prefixes:
https://boathistoryreport.com/direct...urers/?page=47
Going off this list, it does appear that "SEC" was taken by Sam Ervin after SeaCraft was sold, and then again by "Seabird Construction LLC" (maybe a DBA for Sam?).
Either way, I was just checking to see if there is an easy fix for my conundrum. I'd like to hold title for a SeaCraft, but I won't be selling this one anytime soon, so I guess it doesn't matter much.
Thanks again for all the help!