ID this compass
 

The owner of this compass is seeking it's identity.
Quote:
"Original message

Attached is a little item of interest that was given to me the other day by a veteran. He told me that he 'rescued' the compass from a British tank during WWII, that had been knocked out in the Western Desert. I was just wondering whether you recognised the compass or could shed any light on its origin?"

From the picture, it seems to have cast into the base: "91AA/49" and "AFT"