I think your generator set would be a PU5003 (or a close copy of it) followed by a letter, depending on who made it and what engine is powering it, and who made the generator. If made by GE Corruthers, with a Cat engine, and coupled to one of two different brands of generator, then it is a PU5003A/U (generator by Louis Allis co) or B/U if General electric.
A similar generator powered by a Detroit is a 5003C/U (General electric Generator) or else a 5003 D/U if a FATO engineering co.
I have attached the front cover of the Canadian Forces Technical Order data summary.
I think someone else posted a similar generator to yours on MLU in the past year or two. I remember some discussion about the VAOS number on a Cdn built piece of equipment.
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