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If anyone knows how I may get an appraisal , please email me.
While by no means is it an official appraisal, I agree with orstampman who said earlier the stamp could fetch $50-$75 as-is. If it had a certificate of authenticity, based on other sales and listings, I wouldn't be surprised if it reached $200-$300 being such a clear crisp example of the cancellation (and assuming the stamp does not have any faults). If it turns out to be fake, it would still be worth $20 to someone as a reference copy.
The two best sources for a certificate are the Philatelic Foundation,
https://www.philatelicfoundation.orgor the PSE (Professional Stamp Experts) at
http://psestamp.comThe certificate will likely cost between $27 - $50, plus shipping both ways. I give a range of prices because I don't remember how the organizations price certification of cancellations, if they consider that a "specialized" service above and beyond the certification of the stamp. The PF has a footnote that $50 is the certification fee if the cancellation is the key to the value, but I think that only applies to foreign stamps not US.
You mentioned that there is more to the collection than this one stamp. If you live near a big city, you should look for a local stamp dealer or stamp club to get a more detailed evaluation of what you have. Most stamp auction houses require a minimum of like $1000-2000 of total proceeds to accept items on consignment, so it would be hard to sell just one stamp that way.
Feel free to post photos or scans of what else you have and the members here would be more than happy to give you additional advice. It sounds like there may be more than enough in the collection to meet the threshold of an auction, especially if the other siblings want to pool together their portions and sell them all at the same time and split the proceeds. We can help guide you to which auction house best fits the items that you have.
If instead you are just looking for an appraisal and not a sale, the various opinions on this board can also help ballpark it, but it would need in-person viewing for the best results. A written appraisal may be costly, $100 and up, per hour, and every stamp needs to be looked at in detail. Most stamp dealers should be able to give you (for free) a rough estimate just by a quick glance.
A stamp show is the best way to find a variety of dealers under one roof. Your profile says you are from New Hampshire. There appears to be a monthly coin and stamp show in Nashua,
https://ebwpromotions.com/nashua-nh...y-coin-show/Perhaps some members of this forum have been to that show and can recommend some specific local dealers that specialize in classic US.
