I am so bummed. Joe contacted me yesterday and told me that many of the datewheel numbers do not line up. Even though the "6" he tested before he left on vacation lined up well, upon further inspection yesterday, the other number do not.
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As a result I have decided to pass on this upgrade. I do not want to spend more time and money on another datewheel that might work. If any of the watchsmiths have one that is compatible that would be great! Otherwise, as per Joe's advice, I have decided to just relume, water proof and service the A7753. Joe also offered that another pam rep chrono might work and that he could order one at his risk. What a guy! I am thinking of the new pam 356O. The date window which is perfectly centered between the "4" and "5" might actually fit the datewheel.
Thanks for following this thread!