F30T8 in Sylvania sign

This is the bulb that is in the sign. I would like to know the manufacturer date to try to determine the age of the sign.

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Album name:	Bluesvan / Fluorescent Bulbs
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Date added:	Oct 20, 2019
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Date Time:	2019:10:20 17:09:09
DateTime Original:	2019:10:20 17:09:09
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Bluesvan
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This is my first F30T8 bulb. I would like to know the manufacture date.

fluorescent lover 40
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Lights are awesome! :)

September 1966. Somehow didn't see this.

Power provider: Southern California Edison (SCE)

-Date decoder of some US lamps 1960-present.
-Switch and receptacle collector.
-I'll save what I can!

Bluesvan
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Thanks. The sign is probably 1960s vintage then. I was surprised to see a T8 bulb and not a T12 bulb.