Four Block First Day Covers / Cachets
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(80) 1960s 4-stamp Block FDC First Day of Issue PLAIN ENVELOPE Covers No CachetSep 7, 2026(80) 1960s & ‘70s 4-stamp Block FDC First Day of Issue PLAIN ENVELOPE Covers No CachetSep 7, 2026(80) 1940s ‘60s ‘70s ‘80s 4-stamp Block FDC First Day of Issue Covers with & without cachetSep 7, 2026(80) 1950s & ‘60s 4-stamp Block FDC First Day of Issue PLAIN ENVELOPE Covers No CachetSep 7, 2026(80) 1940s 4-stamp Block FDC First Day of Issue PLAIN ENVELOPE Covers No CachetSep 7, 2026(80) 1970s 4-stamp Block FDC First Day of Issue PLAIN ENVELOPE Covers No CachetSep 7, 2026(80) 1940s 4-stamp Block FDC First Day of Issue CoversSep 7, 2026(80) 1940s & 1960s 4-stamp Block FDC First Day of Issue CoversSep 7, 2026(80) Mixed Date 4-stamp Block FDC First Day of Issue CoversSep 7, 2026(80) 1940s & ‘50s 4-stamp Block FDC First Day of Issue PLAIN ENVELOPE Covers No CachetSep 7, 2026(80) 1950s 4-stamp Block FDC First Day of Issue CoversSep 7, 2026(80) FDC COLORANO “Silk” Cachet First Day of Issue and Commemoratives CoversSep 7, 2026(100) FDC United Nations FLAGS Block of 4 stamps First Day of Issue CoversSep 7, 2026(80) 1950s 4-stamp Block FDC First Day of Issue CoversSep 7, 2026(80) 1960s 4-stamp Block FDC First Day of Issue CoversSep 7, 2026(80) Mixed Date 4-stamp Block FDC First Day of Issue CoversSep 7, 2026 
