I was thinking about getting into bass trumpet and this is one that might be a good first buy. What are the specs, specifically the bore? I'm having a tough time tracking down the info.

Unfortunately I was spoiled having played a thein NY in Bb for a concert cycle once. Alas I don't have 10k....

The Holton model 58 bass trumpet has a .484" bore and 6" rose brass bell. It was produced from 1949-1965.