One small nit on a statement I read on about page two or so. The Cal 17 is an ETA 2894-2; an ETA 2892A2 movement with an ETA Chrono module, not a Dubois-Depraz module. There are substantial differences including that the ETA module has it's own front-mounted date wheel, driven by gears from a modified date wheel located where the original wheel sat.
The DD module has a window to see the original wheel through, which is why the speedmaster reduced doesn't present the date wheel. Imagine seeing the wheel down through a 3 mm deep hole in the mechanism?
I have one in a modern Link Chrono (purchased from AD at the end of 2019) and it has a top grade movement.
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