Country: Czechoslovakia (Socialist Republic of Czechoslovakia)
Nominal: 20 hellers
Period of chasing: 1972 -1990
Years of chasing of these coins: 1974-1981
Fully identical, the difference is only in the year of chasing
Material: brass
Diameter: 19.5 mm
Thickness: 1.2 mm
Weight: 2.6 g
Edge: ribbed