ok, thanks. In Italy we say "national cases" but they haven't any brand logo engraved otherwise it would be a falsification . On the contrary the watch of the opener has - in my opinion - a very strange logo . Moreover it seems that there is another fading one.
View attachment 399186
This looks anomalous to me.
I know how a retainer ring works, however - in my opinion and experience - that movement is too small for that case
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