Tonga 1985 Survey of the Tonga Trench (ocean deep)

From Stamps of the World

  • Issue date: 27th February 1985
  • four self-adhesive values
  • Printed by: Walsall Security Printers
  • Print process: lithography
  • Perforations: 14 x 14 (die-cut)


Geological Survey of the Tonga Trench[edit]


29s ~ sectional diagram of Tonga Trench and islands
32s ~ diagram of seismic surveying
47s ~ aerial search for oil deposits, off Tongatapu
T$1.50 ~ diagram of sea bed exploration

Self-adhesive sheet stamps[edit]

29s
32s
47s
T$1.50