Thx Capt, actually it's a 5 window, and it's an oddity, a 1955 '1st series', so kinda rare.
I'll post a few more pics of it if ya wanna see it. Didn't wanna stir up a kerfuffle posting non square body trucks. I legit have almost all the generations though:
41 Chevy panel truck, 55 1st series...