I'd find an object at a reasonable price, probably less than £50, and mount it myself.
I picked up a Mk.III reflector gun sight a few years back for only £25. A month or two later, I saw a similar sight, in much poorer condition, asking price £550 because it was on a wooden display base !!
Take a random piece of metal and nail it to a random piece of wood, toss your creation in the back of the garage. Place whatever you would be willing to pay for some worthless old instrument in your top pocket (say $930). Whenever you see a veteran, or group of veterans invite them for a meal, listen to whatever they say for as long as they speak, place the $930 on the table and walk away, never ever speak a word about it to anyone. While veterans from all countries suffer financial hardship and loneliness, people paying ridiculous prices for "memorabilia", much of which is fake, makes me puke. You cannot buy association to the brave.