The Stovebolt Site Forums The Shop Area General Truck Talk fully stock split window with 54 grill???

I've searched and can't find the things I'm looking for. I'm waiting for the title on a truck I'm buying from a neighbor that's been hidden in the woods out back since '74.
It's a 53 or 54 according to title (he can't remember) and so untill he digs out the papers i have done lots of research and am confused. This truck is a 3100 with a grill from 54 the 3 main crossbars and one center upright bar. But it's a five window. As far as owner and I can tell it came from factory like this. Is it possibly a very late 53's truck with grill from new production line or did they use up last of split windows on first bunch of 54's haha.

Thank you for any help. I'm excited to get this truck cleaned up. It has about 50k miles on it. Stick shift. No accidents. Straight six with an oil bath air filter. Under hood airhorns, and large side mirrors with dual door mounts like a semi truck has. Also has a stock spare tire mounted on side.