Deutsche Marks only came into circulation in West Germany in 1948. A German gold coin from 1900 is very likely to be a 20 mark gold coin which was minted between 1888 and 1912, featuring an image of Kaiser Wilhelm II.
The condition of the coin will greatly affect its price. If it is in "BU" condition (Brilliant Unused) it will be at its most valuable. If it has been used and has suffered from wear and tear its value will drop accordingly.
Gold content and size
Gold marks minted at this time measured 23mm in diameter. The gold content is .2304 troy ounces (a troy ounce is a weight measurement used specifically for gold and equals 31.1 grams). Its "fineness", a measure of the gold purity, is 0.9, which makes it about 21.5 carats.
The value of a gold mark will vary according to its condition. In 2010 gold marks listed at auction houses at prices ranging from £217 for a slightly used specimen to £354 for an almost unused one.
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