German Crown Hallmark on the left middle inside back of case above.

Before 1886 many German cities had their own hallmark for silver. From 1886 a single mark of a crescent or half moon and crown (halbmond und krone) was used by all German states. An old German quantification of silver purity was based on sixteenth parts called "lots", e.g. 14 lots was 14 parts out of 16 pure silver, equal to 0.875 or 87.5% silver. A minimum standard purity for silver of 800 parts per thousand (80% or .800) was established in 1884.

These marks were stamped on imported items as well as German made items, so the crescent moon and crown can be seen alongside e.g. Swiss hallmarks such as the grouse on Swiss items imported into Germany, or just on its own if the item was made in Switzerland and imported into Germany before 1880.