Hi Lefty,
I guess the hunt is on! I haven't found one either. I'm going to have to step up my search and see what I can find.
The photo in the book shows one with a US NAVY stamping, I don't know what other service branches used. I've seen loops sewn on the shoulder strap of some BOYT holsters. I think these were aftermarket or custom loops that the pilots had made.
Here's a pic of my S&W model 1917 with the 3 tier OD ammo pouch.
Linda
S&WCA #1965