(U170) 1881 3c green on blue, entire, size 10, knife 54, watermark 5, cork cancel, with "Burlington, VT Feb 24 1882" cds alongside, addressed to West Royton, MA, with preprinted address at upper left, few insignificant edge tears, otherwise v.f. and rare used entire, approximately 15 exist in addition to a known unused entire, with 2007 PFC, ex-Saddleback ($4,750 hammer) (UPSS 451, $7,500) cat. $4,250