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 .. Read more »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

Country:	Canada
Type:	Postage stamps
Series:	Landscape Definitives 1972-1977
Nominal:	10 ¢
Year:	1972
Material:	Dull fluorescent Vertically Ribbed with Two fluorescent Bars (OP4)
Size:	24 x 30 mm
Perforation:	comb 12½ x 12