Hmmm. I am not at all sure about this. So far, most of the inter-war years Omegas which I can find good pictures of
do in fact have "Swiss Made" in the usual 6 o'clock position.
Like this 1927 white gold example -
Or this 1930s yellow gold one with enamel dial -
And there are quite a few more, but you get the point. It seems unlikely that they can
all be re-dials.
John
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