Close collar minting
Close collar minting is a method of coin manufacture that is used almost exclusively today. With close collar minting, the planchet is centred within a solid metal collar during the minting process.[1]
This restraining collar prevented the expansion of the planchet sideways and outwards and thus made it possible to mint completely round coins for the first time. These could also have a slightly raised edge (
coin clipping is very easily noticed. A pearl circle
often adjoins the edge bar on the inside.
Close collar minting is an invention of French
engraver Jean-Pierre Droz
(1746–1823). Its prototype of a functional minting machine had a six-part minting ring.
Close collars were used for the first time in the new
German Customs Union from the middle of the 19th century.[2]
References
- ^ History of the Dime: Part 1 at greatamericancoincompany.com. Retrieved 23 September 2022.
- ^ Hans-Dietrich Kahl (1972) Hauptlinien der deutschen Münzgeschichte vom Ende des 18. Jahrhunderts bis 1878. Frankfurt: Dr. Busso Peus Nachf., p. 34
Literature
- Ewald Junge (1977): Droz, Jean-Piere. "Circular minting". In: Tyll Kroha (main author) Lexikon der Numismatik. Bertelsmann Lexikonverlag, Gütersloh. p. 121.
- Gerhard Welter (1977): "Circular minting". In: Tyll Kroha (main author) Lexikon der Numismatik. Bertelsmann Lexikonverlag, Gütersloh. p. 370.