The "191.740" is the case reference number. The 0,585 (14/24) is actually the Swiss gold fineness hallmark.
Only difference is that it is listed as having an 18K gold, not 14K gold case. Not really an issue, as Omega generally made them in 14K for the US market. Sometimes these would have "DeVille" on them, sometimes not. Doesn't make a difference.
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