Poland, 1948 80z-120z, FDR, Pulaski & Kosciusko Tribute Issue (C26A-C), complete set in horizontal gutter pairs with inscription between, on three registered First Day covers to New York: also singles on separate FDC, all tied, and a third cover with S.S. (C26 Cd) not tied but with matching pmk, Very Fine.
Estimate 200 - 300