Like the Battye, the Newton was named after it's inventor.
Bodies were cast in France too, at Hazebrouck, near the French-Belgian border.
The fuze had to be struck to a hard surface to ignite the 5seconds delay.

Length: 119mm, Diameter: 48mm.

Photos below: left Siegfreid, right photo © Paul Spence.

This grenade was also used as a rodded rifle grenade. Of course these bodies had a threaded hole in the base to accept the rod, but the upper part was constructed differently on the inside too.

Length without rod: 119mm
Diameter: 46mm.