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Vintage silver cufflinks hallmark

Posted: Sun Nov 08, 2015 8:03 am
by Alaincassis
Hi all,
I got silver and plated gold vintage cufflinks, but I can't find country of maker.
It is a mark "850" for silver, and another one, with letters " S I ", surrounding a crown.
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Can you help me ?
Thanks in advance

Alain