How about scanning them and posting? (PS. OL was 83 Sqdn.)
I see OL was 83 Sqn, but still can't be certain if the markings are a D or an O - all will become clear when I post a pic - too big to scan, they're A5...!
My thoughts are, maybe it was intentionally sketched with a 'D', the code not issued, for OPSEC purposes?? It's a possibility. There is no Serial No in any of the pics, unfortunately.
