Thanks, May. I'll do the same.
Got a call from my watchmaker in Toronto today. You're right, the crystal is very unique. He found someone that is making me a custom crystal (double), since they are no longer available. He said thay stopped making the circuits for the quartz models in 1992, but he found a guy that bought up a bunch of them in the early 90's. So he put one in my watch, and is sending another (only $15 each). He's only charging me $25 for the custom crystal too. Unfortunately he couldn't do anything about the crown (no longer srews down). But otherwise it should look like new. =)
I'm going to email TAG Heuer this weekend and hopefully get a response for production years of our model. Keep me posted!