This is an example of a craft-made pistol captured in Vietnam and brought back to the US. While many Vietnamese fighters were supplied with good-quality weapons from other nations (primarily Chinese-made AK and SKS rifles), weapons are virtually never in sufficient supply for guerrilla-type forces and that forces improvisation. In this case, some Vietnamese hops tried to fabricate copies of American weapons - in this case a 1911 pistol.
This pistol was clearly made by someone who did not fully understand its mechanical elements. The safety, for example, is fixed solidly in place, and neither moves nor would function as a safety if it did move. Interestingly, under the left grip panel is an out-of-battery safety that was not used in the 1911 itself, but is common to other similar pistols - and it is constructed in such as way as to not actually function.
The most significant functional concern with this pistol is that it has no locking system, and functions simply as a blowback pistol. This is seen in other insurgent-type arms as well, like the Spanish Civil War Izard. This would quickly batter itself to pieces if used, as the slide and spring are definitely too light to safely fire its .45ACP ammunition.
Chinese Mystery Pistol Overview: https://www.full30.com/video/c2647d75c8bb689ae0ee8d2eec189a25
Another Chinese Mystery Pistol: https://www.full30.com/video/e521dc709b46d87793c117ad15e923b9
Yet Another Chinese Mystery Pistol: https://www.full30.com/video/8e696efb0af16afa37ac9de18a43cd0d
Mystery Rocking Block Pistol: https://www.full30.com/video/b6ed85bed705ba68ff94022b290a66f5
Khyber Pass Colt Copy: https://www.full30.com/video/dfea92a581d9d20b63268a1218015b95
Khyber Pass Martini Pistol: https://www.full30.com/video/ddf8c3ce99f5d6b6c334c5beace98d7c