The story behind the coin
In August 1893 a British prince inherited a German duchy he had never expected to rule. Alfred — Queen Victoria's second son, born at Windsor in 1844, a career officer who rose to admiral in the Royal Navy and had been Duke of Edinburgh since 1866 — succeeded his childless uncle Ernst II as sovereign Duke of Saxe-Coburg and Gotha. He got the throne only because his elder brother, the future Edward VII, had renounced the claim. His new subjects, by the account in his Wikipedia biography, first received him coolly as a foreigner.
Two years later, his face went onto money. That was how the German Empire worked. The Coinage Act of 9 July 1873 kept one currency for everyone but let each member state issue its own 2, 5, 10 and 20 mark pieces, with a strict rule for the obverse — the heads side — that it show the ruling sovereign, or, for the free cities, their arms. The reverse belonged to the Empire: a crowned imperial eagle, DEUTSCHES REICH, the date, and FÜNF MARK between two stars. Every state kept its prince; all of them shared one eagle.
The catch was volume. The same Act capped the Empire's overvalued token silver at ten marks per inhabitant, and Saxe-Coburg and Gotha was one of the smallest states in Germany. There simply was not much room in the allotment. So in 1895 the Berlin mint — mint mark A, the letter that sits beside the portrait — struck Alfred's 2 Mark in a run of about 15,000 and his 5 Mark in a run of about 4,000, plus an unrecorded handful of proofs (specially prepared presentation strikes with sharper detail). A 20 Mark gold piece was made the same year. Then it stopped. No 1896, no 1897, nothing.
Alfred died of throat cancer at Schloss Rosenau near Coburg on 30 July 1900, aged 55. His only son had died the year before, and his brother the Duke of Connaught stood aside, so the duchy passed to a sixteen-year-old boy raised in England — Charles Edward, Duke of Albany, who would strike his own 5 Mark in 1907 and hold the throne until the German monarchies fell in November 1918.

