The 23M represents Paxman's entry into the 'Geyer style' horns. As with typical Geyer-type horns, this model is quite free blowing but still benefits from that unmistakable Paxman sound quality that we have all grown to love. The Model 23 incorporates the Merewether system which allows the airstream to flow the same way through the valve block on both the F and the Bb horns. As the valve rotors turn in sympathy with the air stream, not against it, so slurs and legato passages are beautifully smooth.
And who doesn't love having a Bb tuning slide on a Geyer wrap horn!?