I'm curious to know, when these guns were built, at what point in production was the bottom of the butt stamped with the SN? Did the frame start down the line with that number already on the frame (and with or without the supposedly matching number in the yoke cut), or was the yoke cut number done first, with all its matching numbered parts, and the completed gun then stamped with the number on the butt?
Since all the matched parts, including the assembly numbers, are the same, and the butt stamped SN is different, could it just be a miss-stamped SN on the butt?
The serial number was stamped on the butt first. Thats the only number that matters.