The egg grenade was made of cast iron.
It had a brass pull-friction fuze that was placed in the body, secured by a small screw.
The detonator had to be inserted by the user, carefully unscrewing the base plug making sure no explosives would fall out. Base screws were made of zinc, steel or bakelite.
Unscrewing the safety cap revealed the pull wire attached to a lead pull-button.
Early types had a black body, the newer model (from 1937 on) was painted green.
Bodies that carry a black painted band have a reduced filling.

Weight 600gram including 65gram Trotyl.

In 1940 the German army took over the remaining stocks of egg-grenades renaming them "handgranate 312 (h).

The type shown above on the left with the yellow band was exactly the same body as the No1, but there was no HE-filling. The body was filled with a mixture of sand and saw dust, and had a yellow band painted over the side. A detonator had to be placed, and when thrown, the body would fall apart in only 2 or 3 big pieces. This way the grenade could be used on small "unsafe" training grounds.

Photo on the right shows bakelite base screw, marked "40".
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The picture on the right shows the lead pull-bead with string and pull wire, after use.
Photo thanks to Jim.

Pictures below © Edwin Elderhorst.

Above, top left: Tinplate instruction variation, marked "M" for "Model".
Above, top right: No.1 "scherpe" , new model. Green instead of Black.
Above, lower left: Old model throwing practice. Variation1
Above, lower right: Old model throwing practice, filled with sand and sawdust and plugged on both sides. Variation2
Photo below: New model throwing practice , with steel bolt through the body. The sharp edges of the nut are smoothened.

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A throwing practice is shown above on the right. Several models of this exists:
--Empty No1 body, painted red with a pull cord and split-pin.
--Empty No1 body, painted red with bolt through the body
--Empty No1 body, painted red with a tar filling , half filled.
The base opening was smooth, unthreaded.