Lot of 75x USA First Day Covers & Interesting Envelopes, 75Pcs

Lot of 75x USA First Day Covers and Other Interesting Envelopes, 75Pcs. Half to almost all are first day covers; some number may be Inauguration Day envelopes, local post commemorative envelopes, or other interesting philatelia. May contain a few duplicates. Envelopes may have issues. Image is a sample lot (may be of various dates).