Funny you should mention that, I sold a Rotary last year on eBay (selling another soon). The module was the most interesting I have ever seen of a standard LED watch. If you could tell me how to paste it onto this message I would let you all see it.
Sorry for being an unskilled user.
Otherwise I could email it you of you are interested.
It looks like a high school project with a chip stuck on a circuit board.