It seems that about 20% of those tumblers do sell on eBay tho when something is at even a 35% or less sales rate on eBay I don't mess with it. The tumblers that you can find at garage sales that have value are those that are #1 signed, #2 those with old yet cool designs printed on them, #3 often glasses that have gold or silver fired on paint are ones to check out. The 2 I'm picturing are just a couple examples of ones or types I like to grab, 1 is signed Mercer & the other is signed George Briard. Those are guaranteed sellers on eBay for possibly as much as $20-$25 per glass with $10 each being rock bottom. Those are just 2 examples I have to show ya for drinking glasses as there are endless ones or types that have real value.
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