Olds A6ST, designed late in the Olds history, meant to be the 'ambassador' to the brass band market in the UK.

I assume you mean the MI and the MII. I bought an MII in 1981. Mostly Yamaha parts, Schilke leadpipe and bell but assembled by Schilke. It was an excellent horn, fit and finish was standard Schilke. I had the adjustable 3rd ring replaced with a silver fixed ring.

Good horn, you should be able to get one for around $600-$800 BUT try it first.

https://www.oldsbrass.com/domain.com/trumpet/olds77/suprstar.html

Olds A6ST, designed late in the Olds history, meant to be the 'ambassador' to the brass band market in the UK.