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This thread would seem to suggest there were a variety of dial variations:
https://chronopedia.club/Nivada_Antarctic_Modelshttps://omegaforums.net/threads/nivada-grenchen-antarctic-thoughts.45900/
Thread 'Nivada Grenchen Antarctic Thoughts' ·I came across this today and would like your thoughts. I've never seen a black dial, except on eBay so that's where I'd like to start. I don't see any minute markers which seems a bit of a...efauser ·
To be fair I don't think it is accurate to call it rare more that it's just not common to see many Antarctic variants around 50 to 70 years after their debut in a sales catalogue.
As far as I can tell many watch companies back in the day delighted in making random dial variants just to mix it up and provide the illusion of rarity for a style or individuality.
Nice dial furniture on you variant.
Thanks ghce