Showa retro clock, Tokyo Clock, Seiko small spring-driven clock, Dome-shaped wall clock, Rare clock This has been tested and is in working order. It is a very compact Seiko dome-shaped spring-driven pendulum clock from the early days. It is very rare. I have cherished this for a long time, but I have decided to put it up for sale as I have received about 100 of them this time. This spring-driven pendulum clock is something you rarely see. This is 16,000 yen. A must-see for enthusiasts. I will also be listing another small pre-war clock from the AK company. This is one Tokyo Clock for 16,000 yen.