FIRST DAY OF ISSUE  100th Anniversary of the Discovery of Silver COMSTOCK LODE 4-cent Stamp Block, Commemorating the Discovery of Silverwith Illustration of Comsock Lode 1859, H.T.P. Comstock Issued at Virginia City, Nev., Jun 8, 1959. FDC U.S. 4-cent stamp Commemorating the Discovery of Silver. Block of 4 stamps. Postmarked Virginia City, Nev., Jun 8, 1959 Please shop our ever expanding store! Be sure to add us to your favorites list! Thank you. Powered by Turbo Lister The free listing tool. List your items fast and easy and manage your active items.