There are some very nice stopwatches on display on this thread! My contribution is a high-quality Seiko (1/10) split-second rattrapante, originally produced for the 1964 Tokyo Olympics. These were designed to impress the world during a period in which Japan manufacturers were out to prove their ability to compete at a very high level. Not coincidentally, the iconic Grand Seiko line had also been recently launched, while Toyota Corona and Land Cruisers were beginning to catch eyes in foreign markets.
Mine is a cal. 890. There were a few dial variations, and also a cal. 892 (1/5 second) version.
You can view some other excellent images, including the 15 jewel movement, at this Japanese site:
http://nakahiro.parfait.ne.jp/moji2/seikostopwatch.html
Here is a cool advert showing other variations made for the '64 Olympics:
Click to expand...