cover 2sk. greenish blue and light grey (4th printing) with inverted frame [90], 8sk. grey-brown and grey (1st printing) and 16sk. green and olive-grey (2nd printing) (corner defect) on 1872 (Nov.) XU5 (opened-out and reinforced along apex) from Proestø to Antwerp, cancelled "52" with origin c.d.s. alongside. Rare and appealing despite faults. F.20dv, 23a, 24b. Photo.