Boosey & Hawkes Symphony 1010 model

SN # 441502

The word "deja-vue" comes to mind when you see and play this instrument.  Other than for some extra keys on the lower stack, the keywork and everything else basically reminds me of the Eaton Elite.  The Eaton has thicker silver plating and other minor improvements but these is essentially the same instrument.  Also, apparently when B&H owned Buffet they made this into the RC Prestige (i'm not sure about this)

The extra vent for low Bb or F is only activated on the first ring.  1st pic shows up open.  2nd pic shows it closed.

The original pads - marked all (even the smallest ones) marked G. B. - Gordon Beeson leather pads