P.S. Mentioned in the catalog is caliber 12.68Z, which was introduced in 1929. So I imagine that the date is no earlier than that. Additionally, calibers 8.68Z and 10.68Z, which were both introduced in 1932, are not mentioned. Given this, I would guess that the catalog was printed circa 1930.
Edit: I just read the warning at the beginning which essentially states that watches with the 12.68Z will be delivered with caliber 13.34 instead. So maybe the catalog is from 1929?
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