SeaCraft is defined here:
http://www.classicseacraft.com/broch...raftPatent.pdf
Like, Hermit, I opine that Mr. Moesly's innovative variable dead-rise hull was and still is the defining factor.
The rest of it is evolution. That said, I concur with strick and others that Mr. Potter's 23 is the legacy and what SeaCraft came to be.