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The weights I quote are not necessarily exact but the SMP in steel is around 150 grams. The SMP in titanium is around 111 grams (according to WatchTime magazine).

The SMP Chrono is also available in steel and may still be available in titanium. It is a lot heaver in steel. It is a big watch. While there are a number of face, hands, size and bezel options for the three handed SMPs, the Chrono version is only available with a skeleton hands and Bond style face.

The Chrono uses an modified ETA 7750 movement. The standard SMP uses a modified ETA 2892A2 movement. Both are highly regarded.

The Chrono is only available as an automatic. If absolute accuracy over time is paramount, then the quartz SMP may be for you.

The deviation of an automatic COSC certified movement is generally + or - 3 or 4 seconds/day. This varies from watch to watch. After break in, many movement exhibit far greater accuracy. Since accuracy in an automatic is dictated by type of use, temperature, position and other factors, the accuracy can vary over time. However, if, for example, your watch runs 2 seconds a day fast while wearing it, you can often identify a position (e,g crown up or crown right) in which the watch will run a bit slow over night to compensate.

I wear my SMP around 16 hours a day and place it on my night stand crown right for around eight hours. Doing that my watch has been accurate to less than 10 seconds a month.

Mark