“33.3 Chronograph”
Omega reference 2393, a vintage 33.3 chronograph family represented by CK/OT material-prefixed examples. The CSV structured ref is 2393 with OT2393 wording; Timeline, Omega Forums, EveryWatch, and Antiquorum corroborate CK/OT 2393 chronograph examples with Cal. 33.3 and roughly 37.5-38 mm cases.
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