Tim,
All indications thus far is that you do have a Moesly built. In those days, the hull numbers were not molded into the fiberglass, just plates mounted.
I have one of the original name plates from the 60's, made of pot metal. I used it for duplication of the SS version posted on this site & also MoeslySeaCraft site. The smaller of the two available IS the original size. Slight modifications were needed for reproduction and "Miami, Fla" was changed to "Classic". See picture of original. If you have holes for the nameplate, that's another indication, as Moesly used nameplates & Potter used the stickers.
This is a great site and everyone is always very willing to help another member ... questions are welcomed.