5 kopeks/1881/SPB (Saint Petersburg mint) // Double-headed eagle, mint-master's initials. 32.8mm, 16.37 grams. Saint Petersburg mint. Y#12.1,Y#12.2

This type was minted for decades under the Tsars Alexander II (1855-1881), Alexander III (1881-1894) and Nicholas II (1894-1917). 

SKU  x12169-w70431