A roll die is literaly a round wheel-like surface that contains a raised version of that is to be impressed into the metal. This die is then rolled over the steel surface under pressure, presssing the design into the metal, in this case the initials on the Luger's chamber. This as opposed to a struck die, which hammers the design straight into the metal. This is how inspector's marks are applied.
Lastly is the engraving method, which cuts a design into the metal through a programed, movable cutter.
|