The early 13 cabs used the 2B1 box with the fold down sides. If yours doesn't have fold down sides this means it would be made after say March 1942. The rectangular roof hatch was used until early 1944 so there's your year range. The only place I've seen serial numbers stamped in F15 frames is on the top of the frame by the front motor mounts. Fords also usually have the engine number on the top of the transmission ahead of the shift lever. The data plates were screwed onto the dash above the gauges on the horizontal surface. The holes should be there. The 2J1 box is the only one that's 80 inches long. It's similar to the 2C1 but it was bolted together. The 2C1 box was 82 inches long.
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