Technically not a mine but...

[Eodtek]

I'll post the picture and let the guessing begin. I have more info on it to follow.

 

[switch]

SOE / OSS Coal camouflage kit - " everything necessary to camouflage a lump of explosive coal" I would imagine that this is an extremely rare item.
Regards

 

[Eodtek]

Winner!

Here is your prize.

My apologies to our French friends but due to the size of the paper I had to deliberately miss something and it was your instructions. Eventually I will photograph and shrink the document so all will be there.