Historically, some Omega watches were shipped un-cased to various countries where they were assembled into locally manufactured cases. This may have been in order to avoid certain import duties. Often, those watches did not have standard Omega reference numbers. Dennison-cased Omegas in the UK are a prominent example. I know nothing about Italian-cased Omega watches, that is new to me, but I'm sure there are experts on the forum who can comment.
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