The body of this offensive M23 was thin walled(0,3mm) , unlike the trainers who were much thicker for multiple use.
The Danish name for it was "Haandbombe M1923".
Germans took this grenade into their stocks, renaming it "Handgranate 342(d)".

Total length: 129mm , Length body: 100mm , Diameter: 58mm.
Weight: 350gram , Filling: 150gram TNT.
Delay: 5.5seconds (2 seconds + 3.5 seconds)

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The grenade shown below seems to be a possible colour variation.
The pull pin is one of several types.

Photos © Randy.

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Used as a defensive grenade

Click on the picture to see more information on the fragmentation sleeves for this Offensive grenade.