I'm thinking Paceship PY23 or ODay 23 or some such.. the coamings don't look exactly right, but I don't think it's much bigger than that.
Looks like Ray Hunt's work, whoever built it...
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"