Can anyone ID this please

[dickandjill]

Can anybody identify what this is ?
Its stamped with a small arrow which I believe makes it military
We though maybe it was some sort of navigation tool or mini periscope type of thing
Its got us stumped
Any ideas?
Thanks

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[Leshy]

Looks like a tondeldoos tinderbox... But I maybe wrong.
https://survivalsherpa.wordpress.com/tag/tonteldoos-tinderbox/

 

[Mesquite]

Looks like a bore mirror for inspecting gun bores

 

[brambles]

It's a bore viewer, allows inspection of rifles while still held by soldier

 

[dickandjill]

Thanks a lot
Just found out its probably for a 1886 model Winchester which used a 0.458 inch bullet ( the OD of the tube measures 0.458" )
According to Wikipedia the Royal Flying Corps in WW1 bought 1886 model Winchesters chambered for the .45 bullet
Cheers