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Yes, quite interesting indeed. Now that gun appears to be a "USGI" style gun, except for the flat MSH. Which I suppose could have been replaced at some point... I guess my thought is that this is either an old (possibly very worn) USGI 1911 or one of the newer USGI-style guns being currently sold, which tend to be sold at the bottom end of the price scale for 1911's and may not get the care and attention that a more expensive gun gets when it is assembled/built. Or maybe even a Norinco, maybe an old one. Who knows?...
I'd be curious to see the same x-ray with a modern mid-range 1911 like an STI or a Kimber and see if there are any differences.
Thanks to the OP for posting this!!! Very interesting!