Diameter:22,5 mm
Metals: from 1936 to 1939 Copper (Cu), from 1939 to 1943 Bronze.
Weight: 5 g

This coin was minted in the years you see on the left. Difficult to found are: 1936.
From 1936 to 1939 (included) the coins where minted in Copper (Cu) the colour is a bit red because of a small quantity of tin and zinc, from 1939(included) the coin are of Bronze (Copper, aluminium, zinc) and the colour tend to be a bit yellow.
The coin was minted for the proclamation of the Empire.

  Smooth border

Difference of color between the coin of copper and the one in bronze

The copper coin, when circulated that a very nice black coloration.