Collected and studied during the 1970’s, unseen for over 40 years. Top quality fresh examples. Excellent basis for research. The item “US Used #1 shade variety study Cat value $12,775″ is in sale since Thursday, March 31, 2016. This item is in the category “Stamps\United States\Collections, Lots”. The seller is “tenshillings” and is located in London. This item can be shipped worldwide.