If you are into coin an stamp collecting you need to stop by and visit Coin Galleries. They have very rare finds and they will buy you r old one or trade. Friendly.
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Stacks Bowers directly sells and buys rare coins,currency,and precious metals. Especially rare or valuable items (usually valued at $5,000 and up) are viable for one of their signature auctions. In addition to the three main services of buying,selling,and auctioning rare coins,Stacks also regularly performs estate appraisals. They can also assist with sending items out for grading and certification to PCGS,NGC,and PMG.