Looks like a Korean War vintage military issue .The PE95G and PE95H have 4 cyl Jeep engines. They are 14KVA, 10KW machines. They were built in WWII but saw most of their service in Korea & Nam running hospital units etc, The C version was only 5kw but still used the jeep engine
They were monsters back then, My Dad had one out in the Everglades WW2 military surplus, one banger diesel, 9.5kw, had to put pennies under the exhaust valve stems before cranking, once you got the flywheel up to speed you grabbed the pennies out with a pair of pliers and hoped it started popping, back in the late 60's we would loose power every other week, you could also use the flywheel as a PTO to drive other equipment like the old farm tractors, we used it to drive an old saw mill for cypress cutting until they band harvesting cypress.