Brass striker id please

[Eion99]

Can anyone ID these strikers?
One side has a grove with a cut out an the end. The grove runs to the back and up the other side as in the pics.
I know there English WWII that's all.
Thanks

 

[kiwieod]

ive seen that somewhere before just cant think where at the moment,possibly from one of the boobytrap switchs,or ignitors?

 

[Eion99]

Thanks, I would like to know more as I have quite a few of these and some other small parts that came the same source?

 

[TimG]

Is the end opposite to the striker pin, internally threaded?

TimG

 

[Eion99]

No it has the same grove all around