Unveiled in 1960, the 521 was the first and arguably the most desirable offset asymmetrical Accutron design.Known as one of the popular “TV watches” from the brand at the time, it is no surprise that the King, whose careerwas launched on the iconic television series, The Ed Sullivan Show, took a liking. A watch fit for a king, the Accutron521 was a unique standout and unlike any other watch at the time given its unique case shape. The original modelfeatured a 14-karat gold-filled case and was unique in that it was the only model in the series that contained a mineralglass crystal and a snap-on case back.