STOCKHOLMIA 2019 & ERIVAN Worldwide Rarities

1855, 24 skilling Bco. brickred, fresh colour and with a very nice perforation, used with superb strike of Stockholm cds. of 29.4.1857, repeated at left, on small envelope to Zeitz in Saxony, originally endorsed "via Lübeck" but changed into "f Nagler via Stettin", adjacent red "Aus Schweden". The cover with faint vertical crease not affecting the stamp. Very attractive and fine. Opinion Sjöman (1974) and certificate Dr. Helena Obermüller Wilén (2018) (Facit 5c)