Trying to figure out what I have... with a 12 digit vin

Pulled a delivery van from a property we’re cleaning. I can’t figure out what I have. There are no markings to identify the manufacturer. One sight told me it was a 61 Chevy step van, but when I search images nothing like it comes up. And it has a Cadillac motor. Anyone know what it could be?

It’s a Grumman. Apparently yours was built on a Chevy or GMC chassis, hence the VIN.

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Having a Cadillac motor isn’t all that helpful since many, years have passed, many wrenches have turned and likely the motor has been swapped.

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Or a Boyertown.

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Thanks! You’re the first one to give me that name. I was thrown off by the turn signals. Everything I’ve seen, they are flush with the body.