I don't believe it's US. The image is close, but there are differences. On the US horn, the mouth piece is away from the body of the horn and there are two separate tassels.    It more closely matches a Jagerhorn. Or Postal. But mine is oversized.   I posted two smaller versions on this forum some time ago, but it's been too long and I can't find he thread. I believe someone commented that those resembled German/Austrian postal insignia. I ended up selling them. One of those horns had a black eagle (Hapsburg?) inside the coil of the horn.  

$40USD is actually what some of those higher-end "museum quality" reproduction badges sell for.  That buckle looks like it's been put through the ringer by a veteran re-enactor rather than artificially aged.

40 for the lot… so not hurt bad… 

I think I found it...   M1872 U.S. Army Infantry Bugle Cap Insignia   (Likely a reproduction)   Source:   https://www.buttonbaron.com/M1872-US-Army-Infantry-Bugle-Cap-Insignia_p_3063.html?amp=1  

Thanks for the pictures, "phantomfixer"!  I liked seeing them.  Great images.   Many thanks, "Preppy Picker", "Rakkasan187", & "Marshallj"!  Spot on!   One lesson here...  I learned a long time ago that "vet acquired", "vet bringback", "veteran this" and "veteran that" was a sure signal that the buyer's about to get burned by a predatory capitalist seller.   That silver wound badge looks like a higher-end fake, and may be made from zinc, like the originals.  I myself had a post-war Rudolf Souval ("L22") hallmarked silver wound badge...  Struck from lead!

I wouldn’t buy any of these unless it’s for cheap. If you have to dispose of them it won’t be easy. And it seems the seller isn’t telling you the truth.

Thanks for the info guys….…. I did ok, even if the wound badge is fake…👍👍✌️

Pleuger & Voss of Ludenscheid were known makers of Tinnies, not Wound Badges. Their RZM assigned number was M9/95 for Tinnies.   There was a fake Luftwaffe Pilot's badge with the Pleuger & Voss mark which was also identified as fake on the WAF   The wound badge is fake   Leigh 

The buckle looks real but ground dug. I would question why a 90+ vet would have a ground dug buckle. Vet acquired buckles might  show wear but not decay like that one. The wound badge looks a cast fake. I have never seen a Pleuger u. Voss wound badge. I am always learning and willing to listen to other more knowledgeable collectors.   

Thanks for the help all…. and the holster is a 1917 Perkins Campbell 

Perhaps it is European, because it isn't the US Model 1872-1875 Infantry insignia. The mouth of the bugle is facing the wrong way and there would be another tassel hanging from the cords.

Interesting it's not European. An original piece?