Type-1	Its rarity is:	It was used between: 1894 and	Ink colours:	Notes: Earliest known usage 1894
Type-2	Its rarity is:	It was used between: 1900 and	Ink colours:	Notes: Used circa 1900
Type-3	Its rarity is:	It was used between: 1911 and	Ink colours:	Notes: Reused briefly in 1934
Type-4	Its rarity is:	It was used between: 1920 and	Ink colours:	Notes: Used in the mid 1920s
Type-5	Its rarity is:	It was used between: 1935 and	Ink colours:	Notes: No apostrophe between the O's in NIUAFOOU
Type-6	Its rarity is:	It was used between: 1962 and	Ink colours:	Notes: Apostrophe between the Os in NIUAFOOU
Type-7	Its rarity is:	It was used between: 1980 and	Ink colours:	Notes: Niuafoou postmark in current use
Type_A	Its rarity is:	It was used between: and	Ink colours:	Notes: Rubber stamp with penned examiner number
Type_B	Its rarity is:	It was used between: and	Ink colours:	Notes: Label used to reseal envelopes after being opened by examiner
Type_C	Its rarity is:	It was used between: and	Ink colours:	Notes: Rubber stamped mark
Type_D	Its rarity is:	It was used between: and	Ink colours:	Notes: Celophane tape used to reseal envelopes opened by examiner
Type_E	Its rarity is:	It was used between: and	Ink colours:	Notes: Gummed label used to reseal envelope opened by examiner
Type_F	Its rarity is:	It was used between: and	Ink colours:	Notes: Rubber stamped mark