What is the value of 1858 Remington 44?
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Nearly every state has a gun collectors association and/or an antique gun collectors association.
Try to use Google to obtain the name and contact information of [the name of your state] [antique] gun collector's association.
The association's contact page should help you to obtain referrals to experts in your own state that are knowledgeable about the values of antique cap & ball revolvers.