Exclusively from Hammacher Schlemmer, this is the only pocket watch that maintains its unerring accuracy from the radio clock transmitter in Fort Collins, Colorado. Providing accurate time across the entire lower 48 United States, the watch's radio receiver synchronizes with NIST-F1, the United States' atomic clock which will never gain or lose a second in 60 million years. The case is made from surgical-grade stainless steel; the watch face uses analog hours and minute hands with an LCD that shows date and seconds (a press of a button alternates between date and seconds). The 14" stainless steel chain terminates in a lobster-clasp. 2" Diam. x 1/2" D. (4 oz.)