Unknown Grenade; Looking for Identification

[ordnance]

I saw this grenade last week but am unable to identify it. Very nicely made. The blue-grey color sort of looks French. Threaded on the bottom, probably for a rifle launching rod or possibly combination hand/rifle? Anyone recognize it? Thanks.

 

[US-Subs]

Looks fake to me Rick, hope you didn't spend too much. You should probably get rid of it.

 

[ordnance]

Jeff,

It's one I saw at at show but didn't buy because it was unidentified AND a lot of money. But I might work some sort of trade for it if we can figure out what it is. I didn't have any measuring tools with me but it's about 2 1/4" in diameter and 6" or 7" long. It sure looks WWI vintage to me. Someone must have seen one like it somewhere but I'm stumped.

 

[Millsman]

Never seen it before but my first impression was it was like a Russian stick mine. 2 1/4" Diameter seems big for a rifle grenade but it is the same diameter as the monster Austrian Zeitzunder rifle grenade.

So as a long shot it might be a Russian copy of the Austrian Zeitzunder but with a set back striker, similar to the Hale's types. The brass work looks WW1 vintage. Other than that - stumped!

 

[MartinS]

I get japanese vibes from it for some reason. It also reminds me of WWI German mortar rounds. Hard to tell without something for scale.

EDIT - Possibly a rifle-grenade variant of the Spanish M1936 Grenade?