Hi

According to what I could find online this was made by C.G. Conn sometime between 1911 and 1913. The serial number is 122118. It's bore is medium at .4453. It's been sitting unplayed at my parents house for almost 60 years. Mom and dad aren't even sure how we came to own it. It was pretty severely tarnished but cleaned up really nicely. It's really a beautiful instrument. Valves work great and compression is good. All serial numbers match. It really has no major dents at all and the bell is perfect. It has minor 'dints' here and there which, hopefully, you can see in the photos. The lead support needs to be re-soldered. You'll see that in one of the photos. Slides all work great. One side of the spring on the upper water key is broken but it still closes tightly enough. The case has seen better days but it still gets the job done. The mouthpiece is a Model 18 Conn. There's nothing else in the case. No other slides or mutes or anything. 

Please let me know what questions you may have. I don't know a whole lot about brass instruments so just let me know what other info I can provide. 

Thanks for looking!

Andrew