Notice the red just below the 40 NP stamp. The registered envelope seems to be a Bahrain H&G C3 registered envelope that was covered by the 40 naye paise issue and an added 1 rupee issue. The envelope was cancelled in Abu Dhabi on 23 March 1964. Abu Dhabi issued its first stamps on 30 March 1964. (I will add a copy of the H&G C3 for comparison when I can get a copy of an image.)
Was this an official use of Bahrain registration envelopes and did Abu Dhabi use other Bahrain postal stationery? Maybe you can help with the answers.
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