rocker switch

The "20A 12V" nomenclature on the switch isn't part of its part number, per se, but the electrical ratings of the switch (12VDC at up to 20A). 1117 may be a date code for when the switch was manufactured--the 17th week of 2011. It might also be some sort of a part number or abbreviated part number.

How many electrical terminals are on the switch, and what size/type are they? What are the dimensions of the switch? How does it mount to the panel it's in? If you find a switch with adequate electrical ratings, the same contact configuration, a compatible physical mounting and electrical terminations, you can use it; you aren't limited to the specific manufacturer and model.

If there are six electrical terminals on the switch, it's almost certainly a DPDT switch. If there are three, it would likely be an SPDT switch. If it is internally illuminated, add two additional terminals for that--which are not essential for a replacement for operating the shade. In any case, I assume it's a center-off momentary switch, meaning you have to hold it depressed on one side or the other to make things happen.

My rocker works both up and down it has 6 termatals on the back?
Thanks. Scott

This is a Carling switch. Amazon carries them. Does it look something like this?

Can you see any other markings on your switch?
Look through the site. I am guessing it is on/off/on configuration.
Momentary on/off/on switches