A beautiful piece. Hamburg issue prized and sought after by collectors.
Obverse: coat of arms of the city, below it the initial of the mint J, above the coat of arms the legend:
FREIE UND HANSESTADT HAMBURG;
Reverse: eagle of the Reich, in the rim legend:
DEUTSCHES REICH 1913 20 MARK;
Gold, diameter 22.5 mm, weight 7.97 g