I know we have focused on Germany, France, England and the US as well as others for WW1 era Grenades, but I thought I would post some information about grenades made and used by the Bulgarians in the great war. One of these was called the Odrin Grenade, which was designed by Col. Simeon Dobrevski, which was an improvement on the older Makedonia model introduced in 1906.It was ball shaped, looking like a French ball grenade but with the fragmentation exterior of a Turkish grenade. It was put into service in 1915 and remained so until the wars end. The body was cast iron, and usually painted black or coated in a black colored varnish for protection. It was filled with about 100 grams of Balkanit or Bombit, both of which were a mixture of chemicals. The grenade used a percussion type fuse which was usually made from brass. The grenade was 77mm in diameter and weighed about 770 grams.
Photo source: Internet