Century Chronometer - L4.721.2 JDM thereby reducing lubricant breakdown and

thereby reducing lubricant breakdown and friction on the automatic movement for superior chronometer precision

utilizing a polished stainless steel case with the iconic multi-faceted lugs that catch the light with every movement of the wrist

making it easier to polish

The acrylic crystal enhances the vintage appeal while preserving the dial’s clarity

Century Chronometer - L4.721.2 JDM thereby reducing lubricant breakdown andYou are looking at a watch built on a scientific principle! The incredible selling point here is the "VACUUM" construction. Century's founder, Hans Ulrich Klingenberg, patented a system in the 1960s to literally evacuate the air from the watch case, then seal it to create a vacuum. This wasn't for water resistance (though it is waterproof); the core purpose was to eliminate moisture, dust, and, crucially, oxygen, thereby reducing lubricant breakdown