My RAOC man was posted from Deolali and taken on strength "RPA" and after 2 months struck off strength "RPA". From other clues this was at Rawalpindi. It has the look not of a unit per se but of some umbrella oufit but I don't know. Grateful for an interpretation. Max
There was a Rawalpindi Arsenal that existed 1939-43. It then reverted to the Ordnance Department. The abbreviation may be the RP from RawalPindi and the A from Arsenal.
My guess is confirmed here on Facebook: https://www.facebook.com/pg/GurkhaAntiques/photos/?tab=album&album_id=565736863558124
Thank you Dryan67 - Rawalpindi Arsenal it is, lots fo find on Google oincluding: Rawalpindi Cantonment Very grateful to you Max