The horn that I remember clearly had Roland Meinl engraved on the bell and this mystery horn appears to be identical to that horn (as I recall it) except for the clock spring valve. It might be a stencil made for Roland Meinl by some other maker.
Great thanks everyone!
That just about wraps it up. I'll post some pictures and my impressions if and when I buy the tuba. If it's a good'un looking forward to trying out lots of Prokofiev and such like )
All the best
Phillip
Alexander 157 f ex Paris Opera 1990
Melton 2250 f 6/4 2010
EEb Besson Sovereign c 1984
Miraphone 188 CC c 1995
Conn 34j BBb 1921
Hirsbrunner HB 21 c 1994
Melton Klemmens Propper F ex Opera de la Monnaie
B&S GR55 BBb 2013
Conn 20k sousaphone 1947