The best way to judge that is to search ebay “sold” listings. A lot of people list things with a very high, very hopeful price that never sell. People use Amazon as a gauge, too, but it’s usually more hopeful asking prices by third party sellers that don’t actually sell their stuff until they lower the price.
Trouble is, ebay’s history only goes back so far, and these lyres aren’t exactly sold frequently. You could put the auction on your watch list and watch for what it actually sells for.
Also, thanks for taking the time to post the pics. It’s beautiful.