I don’t have answers to your questions, but I will comment on the “disappearance” of the Louis Brandt name. I have two Louis Brandt CCR railroad approved pocket watches, presumably from circa 1910. Both movements are marked Louis Brandt & freres. One dial is a private label for a Canadian retailer, and the other has the dial marked for Louis Brandt & Freres. Fast forward to the late 1980s or thereabouts, Omega produced a limited series of Louis Brandt wrist watches. One being equipped with a perpetual calendar, all in 18-karat gold.
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