Hello, this is a "4 line Zenith" Daytona 16523 or 16528 dial (all gold or two tone gold and stainless). It is not a 16520 dial, you can tell because the lettering and markers are gold, not white. If it was a 16520 dial it would be very valuable, even in this condition, and someone would likely buy it to restore it as the 4 line 16520s have really jumped in price. I can't tell you what the 16523 / 16528 dial is worth, but I'm sure to the right person it will be important ...
Good luck, hope this helps
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