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@anidel
Now, anyone knows what the lettering means?
In my case it's Shimano 600 "oo" , but on-line I've seen different namings.
Also the Shimano 600EX freewheel (MF-6207) has a black inner ring:
http://www.disraeligears.co.uk/Site/Shimano_Bicycle_System_Components_%281984%29_page_96.html