368 US First Day & Event Covers All Pictured 1930s-1970s. Includes some plate blocks & better cachet designers. See scans below for details. Powered by SixBit’s eCommerce Solution. The item “368 US First Day & Event Covers All Pictured 1930s-1970s” is in sale since Wednesday, October 24, 2018. This item is in the category “Stamps\United […]