 Lead weight, 29 mm diameter, with inset fragment of insular metalwork, Aldwark, North Yorkshire.
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Randy Blake May 2025 Up Up and Away
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 Viking Age scales and spheroid oblate weights
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 Better than a Squirrel or a Rooster
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 Comparing Variator Roller Weights 7gm(on left), 6gm, 5gm(on right) Rear Wheel Speed vs RPM at Full Throttle
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