The black bodied Nr.2's are in fact Nr.1 grenades which were used with a small black powder charge for training.
After throwing, grenades were recovered and the B/P charge got replaced.
On the first No.2 grenades, "Ontsteker Nr.12" was used. (French BA35)

The grenade shown below used the same body as it's ealier model, but with a new type of fuze.
Fuze designation in the Dutch Army was "Ontsteker No.19"

Length w/fuze: 115mm , Diameter: 55mm. Weight: --gram.