Weitzman is selling the world’s most valuable single stamp, the 1856 One-Cent Magenta from British Guiana, which he bought in 2014, and one of the world’s most valuable coins, a $20 US gold ...

Thousands of Americans will leave a mark on the U.S. Postal Service’s latest commemorative stamp. In honor of the 50th anniversary of the March on Washington, the agency today unveiled a limited ...

Weitzman is selling the world’s most valuable single stamp, the 1856 One-Cent Magenta from British Guiana, which he bought in 2014, and one of the world’s most valuable coins, a $20 United ...