Mystery!
Pete, the official photo says it's a 7 1/2 ton Mack, S/M 6242. The back says it's " L 5559024" except THIS IS NOT LISTED! Demand S/M 6242 was for H 5589005 to 5589104 and 5837426 to 5837549, for ‘Tractors 6 x 6 Super Heavy’ . I assumed it was a NM because we have a photo of a crate with one in, NM "6x6 Prime Mover". However no Census Number just the US contracts W2425-QM-710 and W-670-ORD-3352.
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