Description - PM type 33 (JC) type 20 (RF-MN) type 30 (GD Burma) square-shaped diamond with 10 thick bars including tips.

Considered an experimental PM prior to allocation of type 32 PM series with numbers. In use between 1873-80 according to Cooper, although an instance in this collection is recorded as late as 21st June 1884 Bhagalpur. Some less easily verifiable examples are noted to 1886. Also used in Burma under Bengal postal sub-region. Fairly common except verifiable examples in Burma.