Operated from 1989 to about 1998, issuing stamps.
Updated 17th July 2003
Operated from 1993 to 1995, possibly later, using a cancellation.
Updated 15th August 2003
Operated from 1983 to 1985 and then from 1996 onwards, issuing stamps.
Updated 31st July 2005
Operated from 1989, issuing stamps.
Updated 20th December 2005
Operated from 1981 to 1984, using cancellations only.
Updated 7th February 2006
Operated from 1983 to 1992, possibly later, using a cancellation only.
Updated 25th July 2005
Operated in 1986, using a cancellation only.
Updated 28th November 2003
Operated from 1990 to 1993, possibly later, using a cancellation only.
Updated 23rd November 2003
Operated from 1985 to 1986, issuing stamps.
Updated 31st May 2005
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