how can you determine value of old crystal glassware that has no markings on it?

I inherited a china cabinet with lots of crystal dishes etc., punch bowl with cups, plates . . . but I can't find the manufacturer on the bottom. How can you determine this without the tedious task of checking online? I think they were purchased around the early 1900s.

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Susannah Birch (WryLilt) says

6 years ago
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