You have a lot of possibilities in properly identifying your mid-late 1800's U.S. perforated stamp. There are several variations and you need to narrow down to the most obvious one. Since this is a perforated stamp you now know this could have been printed some time between 1857-1875. The example you posted can be a possible Scott#, 18,19,19b,20,21,22,23,24,24b or 40.
The only way you can be 100% postive of what you have, is to have it expertize by a professional committee.
The most common issue for this stamp with 50 million printed would be Scott#24, Valued at about $150 USD. in Mint condition and VF centering.
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