A very nice piece with well-preserved details and a fair amount of luster peeking out from under the aged patina.
Obverse: head of the Tsar to the right, in the rim the legend:
Б.М. Александр III ИМПЕРАТОРЪ И САМОДЕРЖЕЦЪ ВСЕРОСС...;
Reverse: eagle of the Russian Empire, below it 25 КОПЕЕКЪ 1887 Г;