Large odd USAF Flap holsters

Howdy Guys , I now have two of these strange holsters, Originally we thought this holsters to be a custom jobs made around one of the Air Force bases overseas and for the S&W model 15 or a M&P.
I just bought another except for a slight difference in stiching they are twins including on odd snap on the back of the holster, Well my M&P Victory is way too small for this holsters , but my model 58 n frame fits fine, could these holster have been made for a n frame ??
I remember reading in a old Guns & Ammo magazine about the USAF issueing .357 magnums during the Korean War ??
any thoughts , robbt :surrender:

https://www.milsurps.com/images/impo...02/usaf1-1.jpg

https://www.milsurps.com/images/impo...02/usaf2-1.jpg