Mmmm...sorry but you know...when a seller states 'no leaks', then that should mean 'no leaks'.
In a perfect world. I always translate "no leaks" as the seller saying "I'm lying." I haven't been disappointed yet.
"Vega" was a trademark of The Vega Company, a huge musical instrument wholesaler in Boston that was established in 1889. Now remembered mostly for their banjos, early electric guitars and
amplifiers, they had a full line of Vega musical instruments (strings, brasswind, woodwind) and accessories. Because of it's later focus on guitars, the company was purchased by Martin (C.F. Martin, the guitar manufacturer).
Miles Davis played a Vega Power Model trumpet before endorsing the Martin Committee II. My guess is that the Vega Power Model was a stencil from Martin Band Instrument (like the op's soprano) and Davis later endorsed the Martin Committee II because it was essentially what he was playing with the Vega Power Model. And Martin Band Instrument has nothing to do with the fact that Vega was later bought by C.F. Martin.
As with most wholesalers, Vega didn't have exclusive supply contracts. Here is a
Vega saxophone made by Conn.
That's all the useless information that I have right now.
Mark