This grenade was made in small private gun craft-workshop Jelen in croatian city of Turopolje.
It was an offensive type and it made for the Croatian army.
The body of the grenade was made on a lathe and it was later used as a base for the TTM grenade.
It was named "SEVER" by surname of croatian engineer who constructed it.
If anyone has more information or photos, please send an email.