I think I remember reading somewhere that some of the large can grenades were retrofitted with the wood block as a spacer when the more powerful and therefore smaller charge explosive used in the 1917 version came out. I am doing a mind blank rightnow on the explosive namesYes, the second stick grenade has the belt hook. It is Mfg. just like the model 1917 except of course larger. It is the only one like it I have ever seen. Inside the can is a wood spacer app 25mm thick. Probably this was the last of the large can designs before scaling down to the 1917 version.
I think I remember reading somewhere that some of the large can grenades were retrofitted with the wood block as a spacer when the more powerful and therefore smaller charge explosive used in the 1917 version came out. I am doing a mind blank rightnow on the explosive names