So far, three different examples of this grenade are known, but there might be more types.

It was made in Croatia in 1991 in the factory DALMACIJACEMENT in Kaštel Sućurac, Croatia.
The factory DALMACIJACEMENT was producing concrete and reinforced concrete before the war, and they also had machines for metal processing, so its engineers decided to produce hand grenades for croatian army in 1991.

Information thanks to Goran.
photos will follow.