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05.13.121 is a subsection of the Ettinger's Standard Catalogue of World Coins ("Ettinger's"), which is an indispensable resource for coin collectors.
05.13.121 covers coins from the German Empire, which was established in 1871 and was in effect until the end of World War I in 1918. Specifically, this subsection covers coins issued between 1871 and 1894, when the reign of Wilhelm I ended and Wilhelm II took the throne. 05.13.121 lists coins of different denominations, such as gold 20 Mark, silver 5 Mark, and copper 1 Pfennig, detailing their specifications and values. Some coins are listed with multiple varieties, offering collectors more refined and detailed information. The subsection also lists special releases, such as the 5 Mark selection from 1871 that highlights the country's unity.