Junghans "solar 1", ca. 1988
This watch's movement and energy buffer is amazing!
A short while ago (Aug 2009) I had taken the watch out of the box and even it was exposed only to ceiling light, it started ticking immediately. I think this had several reasons: a large photovoltaic area (compared e.g. to the small rings of digital Casio Tough Solar watches). Thin hands with very little weight. And obviously the oiling state of the movement is still OK after more then two decades. I was really amazed when I saw the watch immediately starting.