If not on tour for his new album Paradise Valley, singer/songwriter John Mayer is tinkering with his vintage watch collection. In addition to his current horology holdings, which he discussed with the folks from HODINKEE a few months ago, Mayer recently showed two custom concepts that he long thought of, one that would be an update to the much sought after Rolex Oyster Date "Mickey Mouse" Dial. Based on the current Rolex Cosmograph Daytona, more commonly known as the Rolex Daytona ref. 116520, Mayer's concept will have a matte black PVD finish along with an imprint of Disney's famous mouse as the watch's dial face. In an all-black design, there is a concept with white dial as well. Of course these are just concepts at this time, but with all of the resources available to him, it wouldn't be too surprising that Mayer turn his dreams into realities one day.