Postal stationary (envelop with imprinted stamp) 7 kop., but due to the bad financial situation and the devaluating of the Rubel, 8 March 1889 new rates were introduced for mail abroad (in the Asiatic parts of Russia 1 April 1889):
Letters abroad 10 k. per lot (15 gram): so for Leipzig here 10 kop.
Postmark ВИЛЬНА (Vilna)-2 with at the bottom is indicated more information:
ПОЧТ. ТЕЛЕГР. КОНТ. , the abbrevation for ПОЧТОВО-ТЕЛЕГРАФНАЯ КОНТОРА (POCHTOVO-TELEGRAFNAYA KONTORA = Post-Telegraph Office).