I just completed servicing this beautiful vintage Seiko 7548-7010 divers watch. This watch contain a Seiko 7548 quartz movement. The previous person working on this watch broke the top pivot of the center seconds wheel and then covered his tracks. Rather than do the work to find a replacement part and be accountable for the error, he modified the train bridge of the watch by lowering the jewel below the surface of the plate to make contact with the broken part of the pivot— what’s known as the cone. Because Seiko quartz movements are powerful and strong performers, this watch continued to run with this botch repair; however, it did not do so efficiently. I sourced the correct replacement part, corrected his work to the jewel (end-shake adjustment), and fully serviced the watch including the case and seals. A key measurement of how well a quartz watch is running after servicing is “current consumption.” This watch is now drawing current well-below Seiko’s maximum for this watch as shown by the Witschi analyzer output. Finally, while I advise against swimming in vintage watches, this watch passed the Witschi Proofmaster swimming test for water resistance, 100 meters.
