This was my father's daily wear since 1969 until he passed away. I don't wear it much. It's an alarm wristwatch. The button at 2 is the alarm on/off switch plus the quick day jump by pushing. The crown at 3 winds the alarm spring, adjusts hour and week day (no quick jump, you may need to turn the hands 12 times to get where you want to), and adjusts (first position) the alarm time which is displayed by the inner rotating bezel. Like many automatic Seiko of its time, you need to wear it to wind the movement for not having a manual winding position. It looks larger in the pic than it actually is at just 38mm, probably due to the light, my rather thin wrist, and the outer bezel/case being pretty slim too. It's been recently adjusted, there're no spare parts so when something breaks probably no chances to get it back working. It's going about +10 seconds/day on the winder, a bit less on my wrist. The pic doesn't really make it justice, the dial has this metal finish, so the center inside has a different reflection pattern than the ring delimited by the hour marks. I can't capture that without getting an annoying reflexion on the plexiglass glass. Maybe when I get a decent camera.