Haha..true. "inhouse " is super stretchy word nowadays..actually it meant that the company/brand has a "patent" for the technical work/how the movement is built
Get you.we can agree on that I may used too harsh wording here :p
if brands invent a complete new movement they test it.. but can't Test it for years..see for example tudor and the date issue that the GMT had "kinderkrankheiten". Also a newer rolex movement had a similar "Kinderkrankheit".
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