What are the meanings of the symbol on the back of a wall clock?

Posted in Clocks by admin on November 29, 2009
wall clock
s asked:


Sharp, atomic.
The 4 round raised buttons reads PT, MT, CT, ET. There’s also a small flat button between CT and ET.
How to adjust time?
Wow, thank you, thank you. Now I know why the clock keep running and running and can’t be stopped unless I take out the battery. You all have a nice day.

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