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The story of 6AS7G "Coke Bottle"?

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Hello out there.

What is the story of 6AS7G "Coke Bottle"?
I know RCA manufactured a lot of those, but where there others in US?
Is there some kind of date code on them?
I have seen some with white- and some with red writings on the base, is the white older or...?

Regards from Denmark

The picture is of my Headphone amp OTL based on the 6AS7G. She's a beauty...

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