I've owned two 1961 Unicab's, love these trucks. $3K would be a no brainer for me if it were rust free, but the door looks really rough, and the tailgate is popping too, and worst of all it's white (color all bodymen use to hide bad bodywork), so I am assuming it's been painted at least once, making the rust we see even worse than original rust unfortunately.
And the one thing you don't want in a Unicab, is RUST! Bad enough they have single wall beds. Custom cab though, that's always desireable, but not a big window that most guys look for.
A 61 would have 2 solid bars across the grill and the "FORD" letters in the middle, 62 would have the 2 solid bars plus a thin bar in middle instead of the "FORD" letters if i'm not mistaken. 63 has a grill not even it's mother would love...
1962 grill
1961 grill
1963 grill...who's idea was this anyways?
