The drawn steel body has a top cover which is machinally crimped.
It has eight emission holes in the top.
A normal bend "smoke" safety-lever does not fit this grenade.

Total length :
Body length : 121mm
Diameter : 66mm
Diameter measured over top crimp : 68mm

I'd like to thank Bart (NZ), Francesco (It), and Cory (US) for identifying this grenade as a Police smoke grenade.