Georgstaler-bar

Here’s a strange cipher device: the front-side is a medal depicting St. George fighting a dragon, the rear-side is a cipher disk. Does a reader know anything about the background of this item?

Civil-War-Era-Bovine-bar

The Museum für Kommunikation in Frankfurt owns a cipher tool from the 19th century. Not much is known about it. Can a reader find out more?

KSG-Burst-Encoder-bar

US crypto collector Marc Sachs has shown me a Burst Encoder from the 1950s. A video explains how this cleverly designed device works.

Criptografio-Palacios

British collector John Alexander has shown me a beautiful Spanish encryption device. Not much is known about its history. Can a reader find out more?

Hamilton-bar

Alexander Hamilton, one of the Founding Fathers of the United States, has become especially popular since a musical was written about him. Hamilton left behind a 26×26 turning grille.