The horn is easily identifiable as it is unique. It has a 4 rotary valve block, and a silver garland on the bell enscribed with the maker's name and city: "Terizin, P. Zalud, Theresienstadt".
The dollar worth of the horn is insignificant, however, it's importance is not. It was made by Pavel Zalud around 1939 or 1940. The horn, along with all the other instruments from this maker, were confiscated by the Nazis in 1941 and brought to the camp in Theresienstadt. The Zalud family was wiped out during the war and these instruments are all that remains to remember them by. You can read the history of the Zalud instruments here: https://zagorow.wordpress.com/2019/08/0 ... childhood/
If you see this instrument for sale at pawn shops, swap meets, or eCommerce sites, then know that it is stolen and not the property of whoever is selling it. Don't confront the seller, simply report it to your local authorities and they will take care of any recovery. Send me a pm and let me know about it please.