Rob,
Thanks a lot for posting the pic. It's definitely Mack NM.
The truck has closed cab so we may hope in two ways. 1. It's an early production vehicle (and rare) with the cab from the factory. 2. It was recabbed with a piece of commercial Mack L-model. All after-the-war cabs had turnable ventillation windows in front doors so this truck looks more like it has original one. We can learn more from the chassis nr. It is stamped on a LH frame rail right above a front axle. Consists of NM 4D and following 4 digits. So you need to take a chance when snow will gone but ivy doesn't grow enough to spread it's terror poison. We also wait spring here in Russia having a half meter of snow on flat areas now. Here's a pic of my NM-6 during it's action in last winter. This year it takes its place under the roof. Vlad.
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