Came across this?

[Tweetie1945]

Been offered this unidentified grenade, very heavy wall. The hole it the top is not threaded. I am really struggling to identify it, has the number 8 in numerous places around the edge and you can see by the photo of it with a pen it is quite small.
I was thinking unfinished rifle grenade.????

 

[Slick]

Maybe a stake mine. Maybe VN. Or Chinese. Or Russian. POMZish.

 

[Spaceinvader]

Yep, POMZ stake mine, looks exactly like one.

 

[Ivashkin]

In the middle soviet mine POMZ-2M.

 

[Tweetie1945]

Cheers Guys, Its awesome that so many knowledgeable people are willing to share their knowledge. I do have to wonder sometimes how a lot of this stuff ended up in New Zealand in the first place. Cheers Nathan