Open message in area where date is normally shown on my casio prg-80t is a message thats seems to say open, what does this mean?

The solar watch that you have is broken then.

go here for the manual > http://www.gshock.com/support/

Have the same problem, Casio PRG-80L reads open. No hints about this in the manual. Nor did Votit's suggestion help. Note that although the watch is old there is clearly power left in the capacitor battery. Ended up accidently ito this mode when resetting the time. Assume the open mode is intended for service, but would just like to exit.

it's because the contact that sense whether the watch is opened or not is misaligned.
Just open the watch caseback, re-allign the gold contact on the case-back, and make sure it touches the spring in the other side of the watch.

look in Ebay

browse through my tips and you will find link for all Casio watch manual downloads.

May need a battery replacement. My solar atomic watch battery died after 3 months. Casio said the battery was not covered by the warranty. Check this YouTube video for the battery replacement process:

http://www.youtube.com/watch?v=ogCz2vjUKVg

Follow this link:

http://world.casio.com/wat/download/en/manual/

Rate, please.

I will buy it from you - full price.

[email protected]

Thanks.

Casio solar watch has no battery it is powered by solar,but there is a storage capacitor like a battery.It will last for 5years that capacitor.Try to hold all the buttons and press hold simultaneuosly for 7 seconds this for reset the watch..

Hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE.