A very common mistake. Tri-compax refers to the number of complications, not the number of subdials.
Yes, there are triple calendar moonphase Speedmasters. The 175.0038, based on the Valjoux 7751, comes from the early 90's:
The calendar without the moonphase is the one we see most often in blue, black, and silver dialed versions - the 3222.xx colored bezel and 3523.xx polished bezel are around the forum. The color codes at the end are 30 = silver, 50 = black, 80 = blue.
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