RARE June 26, 1984 double-postmarked *UNOPENED & SEALED* commemorative First Day of Issue envelope pack featuring the CANADA "1959-1984 St. Lawrence Seaway Voie maritime du Saint-Laurent Cornwall" 32 cent stamp (Scott #1015) alongside the USA "1959-1984 Saint Lawrence Seaway" 20 cent stamp (Scott #2091) in very good collectible condition; see photos!

Questions welcome. No returns. Thank you and good luck!