This is my Amplidan Mk4 whenever you make a few  Morse keys you end up with loads of small bits of brass etc, not really much use for anything, so for a bit of fun I thought I may use some of these bits to make an Amplidan type mini key,  HC6U xtal for scale  :() Comparison with a full size one below...
Making a tiny key is quite difficult as often scale has to be compromised for practical reasons, but the adjusters all work as in a real Amp and it actually works as a key!! but not a serious action, It would make a nice paper weight or a fun key in a collection :()