Gemmage on a <i>Pinus sylvestris</i> in Karula national park (Estonia). That (and the one you could find in the left corner of a picture) was probably made before the national park was founded (1993; since 1979 there was a land protection are).
<a href="//commons.wikimedia.org/wiki/User:Kruusam%C3%A4gi" title="User:Kruusamägi">Ivo Kruusamägi</a>
CC BY-SA 3.0
Own made