I know most timers and have extensive files and manuals available and know how to program most timers.
51206 timer is not identified.
Look at options below and add a comment:
1) Open following link to identify timer, and download same-similar manual:
http://waterheatertimer.org/Woods-timers-and-manuals.html#6-week2) Add a comment and clearly describe details of timer for possible identification and instructions.
3) Add a comment with link to photo of your timer posted on Flickr for possible identification.
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