Rotated Die Errors and Other Special Issues
Rotated die errors and other special Portuguese numismatic issues gathered in this category represent a diverse group of pieces distinguished by rarity, technical characteristics or historical purpose. This includes rotated die errors, die rotation variations and rotated reverse examples resulting from misalignment between obverse and reverse dies, as well as Portuguese miniatures produced by INCM as presentation pieces and the Lauer miniatures struck in Germany between the 19th and 20th centuries. It also includes ECU and EURO medal‑coins issued by INCM from 1991 to 1998 and internationally listed as “Unusual World Coins”, pattern and trial strikes documenting experimental stages of Portuguese coin production, minting errors such as off‑center strikes or metal flaws that alter the original design or shape, and Portuguese token‑coins historically used as emergency money or more recently as cultural, touristic or commemorative pieces. This category provides a comprehensive overview of non‑standard numismatic items linked to Portugal’s monetary history, combining technical, experimental and collectible elements of high interest to collectors.
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