Scott #1150 1959 St. Lawrence Seaway Opening First Day Cover FDC Massena NY

This United States First Day Cover features the issuance of the 4-cent St. Lawrence Seaway stamp, Scott #1150, commemorating the opening of the St. Lawrence Seaway in 1959. The cover is postmarked with a clear Massena, N.Y., cancellation dated June 26, 1959, the official First Day of Issue for this stamp. The postmark includes the text "FIRST DAY OF ISSUE," verifying its status as a genuine FDC.