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I have seen the two sets of VIN stamps before.
Mike,
I suspected. AC with 3.73 seemed unusual.
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I've seen real cars with not only double stamping ( stamper hit it twice ) but born with drive trains that the numbers where a couple digits off where the stampers' apparently got out of sync. I'm sure the guys doing the stamping had no idea their handy work would be of importance forty years down the road.