PAIR OF SKY-BLUE-GLAZED CUPS QING DYNASTY, YONGZHENG MARK, 18TH CENTURY 清 雍正款 天藍釉小杯（一對） each delicately thrown with translucent sides of deep conical shape resting on a straight foot, covered on the exterior with a vibrant light-blue enamel, the interior and base left white, the base further inscribed in underglaze blue with a six-character Yongzheng mark within double circle (5.2cm diameter each) Qty: (2) Provenance: Formerly in a private Swedish collection