Probably a one off grenade .I've never seen the like before .It looks like an Italian WW1 Thevenot BUT has only one filler screw in the top .I suspect it's an experimental version from one of the Scandanavian countries made during the 1920's .The body is stencilled ROK HAND GR M/26 R29 REV 4.33 .It would be in MINT ,original condition except for the fact that it has been de-activated by having the top removed with what would appear to be a tin opener [see scans] . It's TOTALLY complete
