I have an interesting thought. You could start a new thread.and have members measure across the balls and submit it along with the serial no and the frame size if so marked. Then someone with the serialization books could take the serial no match it to the ones in the book and see if that measurement corresponds to the no's in the book. Soon you would build a data base and confirm deans theory. Then you could possible use that information to determine frame size on guns that are not marked. Just a thought
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