On August 26, 1903 George Keppler applied to have his newly invented stamping die patented. His method for stamping high relief images into flat metal was used to produce what are commonly referred to as pop-out coins.
Also known as repoussé coins, the image of a face is stamped into the reverse of the coin making the obverse three-dimensional.
Also known as repoussé coins, the image of a face is stamped into the reverse of the coin making the obverse three-dimensional.
Patent Application
 View the patent drawing "Be it known that I, GEORGE KEPPLER, a subject of the German Emperor, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Die, of which the following is a full, clear, and exact description. This invention relates to an apparatus for stamping articles from fiat metal stock. It is especially intended for stamping in high relief images and the like on metal plates or disks for jewelry or other purposes. The invention comprises a die proper shaped according to the image which is to be produced and having at each side a guide, so as to hold a slide which fits over the metal plate constituting the work and holds the edges thereof, the slide having an opening therein, through which the plunger is movable. When the device is used for stamping up images into high relief, as metal disks, a slight cavity is formed around the edges of the die proper, this cavity being of a thickness about equal to that of the disk, and the disk is laid into this cavity face downward over the sunken portion of the die proper. The slide is then placed in position with its opening directly over the center of the disk, this slide serving the twofold purpose of holding the disk and protecting the edges thereof during the stamping operation, which operation is confined to the center of the disk, and also of centering the plunger with respect to the die. When the slide and disk constituting the work have been placed in position, the plunger should be brought down through the opening in the slide, and proper pressure being applied the disk will be stamped according to the form of the die."
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