I have contacted the auctioneers. All three instruments play different notes on push and pull - they checked it for me.
I had a fine 45 key ( plus air-valve ) Jeffries before und it wouldn't surprise me at all, if Jeffries made a 50 plus anglo-instrument to special order...
The next question is, who wants a big one like that these days...
Hello, does someone know how they are tuned (C/G , Bb/Eb, F/Bb, C/G ...) ? Gael