Most of my keys can be described as unusual but this one more than most! I have not seen anything remotely similar, the main arm of this key is a rigid brass frame inside of which is a central post which the main arm swings on, the flanged ball bearings are held in place by the spring of the frame against the brass axle in the central post, The nose of the key is also of unique design the tension spring is held within a threaded post with milled sides allowing a cross bolt which is attached to the spring to be drawn down by a large knurled finger nut to increase the tension of the key action, the top of the same post acts as a fixed return stop, above the front post is an angled arm which holds the gap adjuster with its silver contacts, it is, I like to think a remarkable key, the action is quite hard but very free, much like the old British Post Office keys, and the Beech knob sits high from the operating surface by some 90mm. It has a very distinctive look about it, The wooden base it stands on is solid oiled Oak with green under felt, Great key.