If you read this thread, you will see that the F3 is the 23 Superfish 028 would be the number of your hull out of the factory, but M750 is not correct.
This is an example from this thread showing the breakdown of a typical 23 FT Seacraft Hull ID:
Hull ID: SECF30070778
SEC = SeaCraft
F3 = Superfish 23'
007 = Hull number
07 = July
78 = 1978
Real close to mine = SECF30491278; hull # 49 Dec 1978
Any hull manufactured July or after is titled the following year
http://www.classicseacraft.com/commu...on+code&page=2