This is a Besson (3 +1) valve non-compensating silver-plated euphonium (baritone). It has a lovely, warm sound, has actually been looked after, and is in exceptional condition. I acquired it new in 1988 and played it throughout secondary school and college.
The 700 series corresponds Besson's 1065 series today.
Comes with a locking case, two large-bore mouthpieces, and cleaning brushes. There is one damage on the backside near the hand grip location.