This is a Wonder Improved Nickel Silver Plated tenor, serial number 4107, made in 1900. This horn has a super open core sound. Also you'll notice the absence of key pearls, as this was a time before they were added to the horns. This horn also dates back to before front F was added. This horn definitely shows its age, but does not seem to show history of repair or damage. The body is in great condition for what it is. The body tube and bell are in decent original condition.