A Military Prismatic compass Mk III dated 1943 with the crows foot mark and the serial number No B 227031. The makers mark is T.G. Co Ltd London (The gramophone company). But as the letter "B" is applied as the prefix to the serial number the compass was made by F Barker & Son of London. The mark III  was produced 1932 until the late 1960's and was standard issue to the British army throughout WW2.