My collecting is centred on 'rotor-based cipher systems of the 20th
Century'.
I am no mathematician or cryptographer - just a guy interested in the
history that goes with these systems.
More and more people are collecting them - if they can find them.
Also, I would like to make new contacts around the world.
If you would like to correspond about collecting then please email me.
Regards,
John Alexander (ebay: jalex-uk)
England
Collecting Code and Cipher Systems (de-classified)