Coin of this type was done from 1797 to 1800. In some instances, can be partially raised rim (this is the exception rather than the norm).
The obverse of the coin shows the monogram of Paul I: a large stylized letter "П"with very curved lines at the bottom of Roman numeral "I" upstairs the Imperial crown.
On the coin reverse close-up set value: the number "1" with a dot under it the word "ПОЛУШКА" Held below horizontal line, under which the year of issue "1799". At the bottom of the letters "К.М."(Kolyvan copper).
A strong discrepancy in the mass of the copper coins of Paul I, due to the fact that they had to be weighed in large quantities on the 100.
Species coin 1 Polushka sample of 1797: 1797-1798 (S);
1798 (EAT the side with the monogram stamp minted money (larger));