When King Christian X became king of Denmark in 1912, the monetary
system was based on the gold standard.
The low valued coins were made of copper. The middle valued coins were
made of silver.
The 2 high valued coins were made of gold.
Because of the monetary convention between the Scandinavian countries
it was quite normal to find coins from Norway or Sweden in the circulation.
The minting was shifting between the 3 countries, sometimes Sweden
was doing all the minting, sometimes it was Norway, and sometimes it
was Denmark.