Unknown Grenade

[MN42]

I know that this is a Japanese WW2 grenade. The only markings on it are on the bottom. Beyond that I am absent facts. Can anyone enlighten?    

[Kaptainssurplus]

Japanese type 99

[robinb]

The bottom stamp is the date. February 1944.

[rathbonemuseum.com]

Foreign militaria belongs on https://www.worldmilitariaforum.com/forums/

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