This is what I was told by a German expert on SME arms

"Dear Peter,

thanks for the pictures. The tonearm is not original at all. The counterweight and the antiskating weight are copies and not original. I service only tonearm in original condition. The original counterweights are as spares available, but expensive.

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Mit freundlichen Grüssen, Best regards, Met vriendelijke groet, Salutations distinguées, Distinti saluti, Med venlig hilsen

Robert Graetke
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Analog Tube Audio - finest quality handcrafted in Germany