Omega 321 calibre, secondary market

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Good afternoon all,

With the growing number of the new 321 speedy on the secondary market (together with the slim chances of getting one from an AD), are there any additional points that we should be looking for when buying one in the secondary market beyond the usual checklist for buying a used watch.

Have there been any known issues with the 2020 release that people have had to return these to Switzerland for service etc.

Thanks!