Seiko radio-controlled solar-powered wristwatch. Model number: 1B21-0AH0 I found it while doing a year-end cleaning. It is currently operating with one-second intervals due to solar charging. This is a radio-controlled solar-powered watch that does not require battery replacement. As it is a radio-controlled watch, time adjustment is automatically performed depending on the usage environment. It had been stored in a dark drawer for a long time, and after taking it out and exposing it to light for a while, the time is currently about 5 minutes slow, possibly because it was not sufficiently charged and radio reception was not successful. Please note that the time may be even slower when it is delivered. The exterior appears to be in good condition at first glance, but there are small scratches overall and some areas that appear whitish, possibly due to clouding or dirt, as shown in photo 10. This is a used watch that has been left unused for a long time, so no warranty is provided after purchase. Please understand this fully before purchasing.