It appears to be a relatively early cab 13 as it looks to have a 2B1 based body with dropsides. I don't think there were bodies built similar to the 2B1 for longer wheelbases than 101" so it would be either F15 or F15A. The spacing tire to fender suggests F15 to me. (I don't see the photo clearly but I also suspect a non driving front hub to reinforce the F15 idea.)
Off the top of my head, I don't know the body code for van or wireless body variant of the 2B1.
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