The oldest 144 BCD Record rings have no pin to keep the chain from falling behind the arm. I had thought this pin, was added before SR was introduced, but looking at Calatlogs 17 and 17A, I see SR rings without the pin. Were they really made this way, or did SR rings actually have the pin from day one? I have an old "Patent" logo SR outer, and it has a pin. This does not preclude the possibility that earlier pataent logo SR rings had no pin. So, do any of you have a pin-less SR outer ring? Just wondering.
To be more specific, if I'm assembling a 1977 SR group, pin or no pin?
Tom Dalton Bethlehem PA USA
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Boardwalk for $500? In 2007? Ha!
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