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Look for that along the bottom edge of the windshield or on a data tag on the inside of the door jamb. It should also be on the title and registration (unless that is lost) here.
I have never heard of it being stamped on the frame of a Bounder and even Fleetwood makes no mention of that being done.
I don't think you read my response correctly, so I will opt out of this and let another tech offer a solution if they have one.