A German gold 20 mark piece of 1872, with the head of <a href="https://en.wikipedia.org/wiki/William_I,_German_Emperor" class="extiw" title="en:William I, German Emperor">William</a>. "Weight .256, fineness 900. Value 5 francs less than the British sovereign." [so about 16<i>s</i>] Both sides shown
Name of coin designer or engraver not known
1874
Engraving from the article "Recent Coinage of the World" in the <i>Companion to the British Almanac</i> of 1874.