J’ai demandé à Oméga il y a quelques temps de me dire si cette carrure était une vraie ou pas.
Voici leur réponse accompagnée des photos envoyées après un mois d’attente environ

We thank you for your e-mail and are sorry to keep you waiting so long.
Further to your request we inform you that it is difficult for us to
identify a watch case without having more identification numbers.
We suggest you to hand over the watch-case to a qualified watchmaker for examination and further comments:
The Swatch Group (France) S.A.S.
112, Avenue Kleber
75784 Paris Cedex 16
Tel. +33 (0) 1 538 122 00
Fax +33 (0) 1 457 462 46
We hope to have been helpful to you and thank you for your trust shown in our brand.
Maria Mastrodonato
INTERNATIONAL CUSTOMER CARE
Ω OMEGA SA
RUE STÄMPFLI 96
2500 BIENNE 4
SWITZERLAND
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Seamaster PO 