I would be fairly sure (though happy to stand corrected if wrong) this is a UK military Broad Arrow symbol, depicting British Government owned equipment. The 0 probably refers to an inspector or is a viewing or acceptance mark.
The Broad Arrow is not always depicted as such, a mere arrow head shape, as in the W&C Scott's case, is frequently encountered.
If you dissect my brain you will find a broad arrow through it, from when I had 'the operation' during training at Sandhurst!
Tim
Last edited by trw999; 06/18/13 05:17 AM.