
What Lowe missed in the India Used Abroad list of Renouf/Cooper/Martin type 7 septuple octagonal obliterators are the following 14 post offices in Myanmar.
B12 Pathein (16.7754°N 94.7381°E) (Ayeyarwadi, Myanmar)
B22 Ngathaingchaung (17.3856°N 95.0755°E) (Ayeyarwadi, Myanmar)
B56 Kyaikkhami (16.0766°N 97.5843°E) (Mon, Myanmar)
B108 Kyaukpyu (19.4212°N 93.5458°E) (Rakhin, Myanmar)
B111 Aunglan (19.3603°N 95.2188°E) (Magwe, Myanmar)
B112 Myaungmya (16.5834°N 94.9039°E) (Ayeyarwadi, Myanmar)
B128 Myeik (12.4492°N 98.6271°E) (Tanintharyi, Myanmar)
B129 Dawei (14.0828°N 98.1940°E) (Tanintharyi, Myanmar)
B133 Myanaung (18.2707°N 95.3207°E) (Ayeyarwadi, Myanmar)
B135 Namayan (Bago, Myanmar)
(God knows where exactly it is. I could not find it in either Google or Here Maps.)
B150 Pyay (18.8406°N 95.258°E) (Bago, Myanmar)
B165 Hinthada (17.647°N 95.4516°E) (Ayeyarwadi, Myanmar)
B173 Kyaikto (17.3125°N 97.0149°E) (Mon, Myanmar)
B181 Taungaw (18.9398°N 96.4344°E) (Bago, Myanmar)