M bell taper
Is this an Alexman or a Paxander? However you would like to name to it, this instrument is a full double prototype made by Paxman in about 2014 with a design very much like an Alexander 103.
It is yellow brass, screw bell and unlacquered with an adjustable fingerhook and a backpack case. Have a go! You might just like how this combination of features plays.