Bell diameter is roughly 17.25", bore size is roughly .625". The instrument was silver plated once upon a time. The engraving is difficult to see in the pictures, but it reads " THE MARTIN BAND INST. CO. | ELKHART IND "
The fourth valve cap and finger button is different from the other three, and I'm not sure if its original or not. I attached the pictures in a drive document because I was feeling too lazy to go and shrink all of them down to fit. There's also a video of me attempting to sightread Ordner Seg, listen with headphones for best results. In the video the horn has pink fingerbuttons, just try and ignore them..
https://drive.google.com/open?id=1E8n67 ... -pBf4KaQQf
Priced at $950 OBO. Martin 4 valvers of any key are a rarity, I'm selling because my university's tuba prof. refuses to let me use it in ensemble, so I don't have really any use for it. Also, I get sick of having to constantly stock up on Hetman 14

This is the V&E Simonetti collection page for this horn: https://simonettitubacollection.com/ins ... -4-piston/