Medal "For Merit".

[CtahhR]

Here is Tsar Boris III Bronze Medal with peacetime ribbon and without the "a" in Bulgaria.

[CtahhR]

Here is the Tsar Boris III Silver Medal with peacetime ribbon (1918-1941). This is the type in which Bulgaria is spelt with an "a".

Awarded to Corporal Under The Plenipotentiary Of Our Military Ministry In Berlin Angel Mosinov on 17th September 1919. Document #3781.

I believe Angel is the son of Colonel Dimit'r Nikolov Mosinov, Liberator/Hero Of The War Against Serbia.