Rolex Submariner 5512 Gilt Four Line Underline DialWhen the under is upperIt really is Underline Sub week here at Bulang and Sons. This is probably the rarest of the bunch a four line 5512 with underline on the UPPER half of the dial! The gilt dial is in great glossy condition with the hour plots and hands having taken on a lovely warm patina. The underline mark was used to signify lesser radioactivity in the luminous mixture on the hour plots, following the outlawing of Radium use. For a good while,