This Bulgarian grenade was very similar to the British No15 & the French Mod 14 ball grenade. The grenade was pre-fragmented on the inside. The grenade was filled with 80-100gram explosive called "Bombite". The end of the fuse had a match head type striker & the detonator was a copper tube containing 2 Grams of Fulminate. It had an 8seconds fuze.
This grenade found use in the Turkish army, and got spread all over the Balkan.
Photo © Paul Spence.