Looks to be from the 30s and the case, if original, also appears to be that. Did you search www.saxpics.com?
Or even earlier judging by the cork rolls on the bell keys - but then again they're on the same side, so perhaps the rolls are later additions. I've seen a Chas Foote (a dealer, not a maker, so it's a stencil) bari marked 'Made in France' which could have been a Pierret.bruce bailey said:Looks to be from the 30s and the case, if original, also appears to be that.