Thanks, yes, this makes sense.
Although in Sala, page 335, there is a Tri-compax ref. 22502 serial 1105** from 1945 which has a recessed moonphase subdial as well and there is no comment about the dial being a redial or replacement. But as I said before, the Tri-compax section of the Sala book kind of does not satisfy me...
I went through a few Tri-compax discussions here and I am not certain of anything anymore...
Also - 1945 was the year with the most UG watches produced... so god knows what could happen.
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