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Re: Perfecscope
Not a huge demand for stereoscopes these days, I've several. the cards though can be quite valuable if they depict the American Civil War. Here's a link to current values at auction:
http://www.liveauctioneers.com/search?q=stereoscope&fq=&sort=relevance&dtype=gallery&hasimage=true&type=complete&rows=20&addfq=sale_date_year%3A(2010)