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I am developing The Watchmakers App ( https://thewatchmakersapp.com ) and currently started to update the app with early Omega movements from Omega GF 239 catalogue (1926).
When looking for differences between Cal. 17.4 T1, T2 and T3 I found out from this forum that those might be mentioned in another catalogue GF 494 (1936?). I assume I might find helpful info there about other movements too, as it's marketed as supplement to GF 239. So now I am trying to source GF 494 catalogue, if…
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