Got this PRT-60 along with another very similar one in a lot of 10 faulty watches from Japan, didn't need much to get it working and cleaned up.
The auto light feature is cool, and also the fact it has a barometric pressure sensor. Temperature sensor (kinda daft as it seems to be affected when against skin) and altimeter are nice to play with too.
It's got a cool leather strap (unusual on casio!), and also it seems to be a custom model "birdlife" model with a penguin in the backlight!
It's gone straight into the daily circulation