WW I transport cap?

[wz.KC]

Hi,

Look like some kind of base transport cap, for CP projectile or something.
It's no fuze for sure, just solid plug.
Only one visible stamp; "No 3" (or "No 31")

Any ideas?

Regards

 

[Grenademan2005]

Nice Maroszek, about plug I have no idea, sorry. If you have more Maros like that send me a PM.

 

[doctor]

Hi
Plug N3 for "GB" HE shell