Hello gentlemen here is my small collection of these grenades.
I have only 4 types .
(Kugelhandgranate 13 /2 models/Kugelhandgranate 15,Russian Kugelhandgranate )

Neat. I assume they came from the ground. Are you not afraid to deactivate them, since they are old and old things sometimes malfunction (just look at me!!!).

Vlad i do not deactivate them personally.I I bought them already deactivated.