№ 2717 (USSR)
Description: Outline of lake Baikal, on a circle the text "Lake Baikal", the postal index of post office of Irkutsk - "664000", in a framework date - "1973". It is made in Irkutsk.
Type I - shading of a background often, contours of lake t
hin. Is carried out 2 peregravirovki (without date "1973"):
Type II - Shading of a background rare, a font of all inscriptions identical
Type III - shading of a background rare, a font of an inscription "Lake Baikal" fat, and inscriptions " Irk
utsk post office " - thin.