Forest Area in Central Canada

Under UV light stamp paper emits minimal bluish-white glow, fluorescent bars glow yellowish
Tagging 4mm wide placed along vertical perforations
Stamps tagged with experimental OP4 tagging .. Дивитись далі »which was found to migrate to other surfaces. Stamps should be kept isolated to prevent fluorescent migration to other stamps. Type I - Clear crosshatching within the C of Canada

Країна:	Канада
Тип:	Поштові марки
Серія:	Landscape Definitives 1972-1977
Номінал:	10 ¢
Рік:	1972
Матеріал:	Dull fluorescent Vertically Ribbed with Two fluorescent Bars (OP4)
Розмір:	24 x 30 mm
Перфорація:	comb 12½ x 12