Just google "Ebonite Firebolt" there are three Firebolt (black), Firebolt II(blue) & Firebolt SO.(green/black)
30 years ago is about right, the connected circle logo was the "Gyrobalance" logo and which was used for the Ebonite Gyro Balanced Ball Weighting.
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The Firebolt SO was a short oil ball (thus the SO). See commercial
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