Thank you for contacting Mearto. This is a trumpet made by Orsi Instruments. They have been producing musical instruments since 1836. The factory is currently based in Tradate, Italy. From what I was able to glean through online reviews and discussions, Orsi instruments are considered mid-range quality, not high-level professional. From your photographs, the instrument appears to be in good condition.

I’ve been able to find only a few of these instruments sold at auction, one closing at $114 and the other $850. I also searched for Orsi trumpets being sold, to see asking prices. Below I have added links to what I discovered.

Based on this information the Fair Market Value is between $400 and $500.


Hammer prices:

850
https://reverb.com/item/25224143-professor-romeo-orsi-vintage-c1950s-brushed-brass-professional-trumpet-in-excellent-condition
$114
https://www.catawiki.com/l/41291063-orsi-trumpet-italy



Asking:

$371
https://www.etsy.com/listing/771652723/euphonium-ditta-prof-romeo-orsi-made-in
$450
https://www.ebay.ph/itm/Tromba-ottone-Romeo-Orsi-Milano/233836902205
$780
https://www.ebay.es/itm/Orsi-tromba-bassa-mib-Laccata-matricola-5073-/254549312057
$165-190
https://www.mercatinomusicale.com/cerca/tromba-orsi.html