Brass thing.

[SG500]

I found this in the spares box earlier today and can't remember what its off.
Its definitely military, there aren't any bits off toilet cisterns in the spares box before someone comes up with a bright idea :tinysmile_classes_t
So, does anyone know what I've unscrewed it from? Clearly it should have been put back but I've forgoton what it fits on.
The large thread diameter is about 30mm. The small one about 25mm and the length of it is about 25mm.
Any help appreciated.
Thanks.
Dave.

 

[Fjordhouse]

Hello Dave, its from the 117 and 119 britisch Artillery fuze, its the part that has on one side (picture 3) the booster picture 2 has the internal parts for the fuze. Ben

 

[SG500]

Hello Dave, its from the 117 and 119 britisch Artillery fuze, its the part that has on one side (picture 3) the booster picture 2 has the internal parts for the fuze. Ben

Thanks Ben, appreciated.
Dave.