Has war record inside in R.N. Interesting. 1d with canc. Polish Air Force d.s. This very close to Bletchley Park , Station X, were that had Military guards and a large Military motor pool Probably connected to Bletchley Park. 3d adh canc.
Cover send from USA and f.w.
Instructions blacked out on left with large X and overprinted. On left PC 90 censor label. 3d adhs canc. Army signals Graz in Austria send by Soldier there to London. Airmail cover f.w.