We often feel for 'rare' watches.... often putting value to it. Like the DRSD... it ain't rare and still valued higher then a white one. Ok the 2 red lines are coool. But when we look at rarity (and forget about PPDRSD, Mk2)... this one is rarer. Only produced for a short while like the RailDial. The great white MK1 1665. Right after the MK4 DRSD. Look at the typography.. it's like the MK3 DRSD, which stopped years before. And was followed by the Mk4 DRSD with more non-serif types of fonts and closed 6. And by the way... just look at the beauty of the tritium... that is flufffffffyy.