1. Henke Coll 1_237 Reference (shelfmark): Henke Coll 1_237 Title: United States of America Flag Issue 6c stamp Scope & Content: Marginal block of four perforated MNH stamps with control number depicting the US Flag and White House. The stamp was designed by S. Dohanos. Collection Area: Philatelic Collections Languages: English Date Range: 24 Jan 1968 Extent: 4 Items