1 Koruna - Trial Strike

Czechoslovakia's early coinage program moved quickly after the 1918 declaration of independence, but metallurgical decisions proved contentious — the state mint experimented with several alloy combinations before settling on final production specifications. This copper-nickel-iron trial was part of that process, produced in 1922 as the mint worked through practical considerations of die wear, striking pressure, and corrosion resistance. Iron-bearing alloys were attractive on cost grounds but created problems with oxidation in circulation that pure nickel compositions avoided.

KM# P5 exists in very small numbers by definition — pattern and trial pieces from this period were struck for internal assessment, not release.