Found a neat looking Ricoh in a second hand store today. It has a cal 680 movement that I have never seen before, featuring a "second clear" function where you can depress a button to sync it up with another time source (when it hits 0 you push it and then the second hand waits X seconds to start running again so it's in sync). Supposed to have 7 or 9 jewels and seems pretty well built. However little information about it appears to exist, so I wonder if anyone here might be familiar with them.