What Decca arm is this one?

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I picked up this Garrard 301 with a Decca tonearm. I cannot find any information on the arm. I am assuming it was part of the FFSS series (versus the 'International' series that had more regular half inch mount headshells)...

 

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[MusicMan_ZA]

 

[chrisc]

 

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[PapaH]

 

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