Kaunas mute cancellation 1914 - 1915

This is a postcard of Kowno (now Kaunas) with a rare 1st World War 4 straight horizontal lines mute cancellation during the Imperial Russian rule. Mute cancellations in this period have no date nor location information, mainly for security reasons. They have been used from 1914 to 1915 before the german capitulation of Kaunas in 1915. You can see on the 3rd line of the text that the card has been sent from "Kowno" on an unknown date.

Here is a link of an interesting article about Imperial Russian mute cancellation. It is mainly focusing on Latvia during the russian rule but part of it also applies to Lithuania too: link