This website has been a collaboration of viewers like you and myself. A big thank you to all who have lent their support. This site does not have any financial support and is offered free for all.
The values stated on this site are derived from taking prices from sold prices at auctions. If the stamp is commonly available it will be derived from taking the average of many sales from online auction houses, such as eBay, delcamp, hipstamp etc. If a rare stamp it will be derived from averages taken from brick and mortar auction houses. In either case I will remove the bottom 15% and top 15% of prices and prices of stamps sold with faults. I will also not include a graded stamp above the grade of 85 as these are rare, it is best to use a traditional catalog if you wish to include these in a valuation.
I update the values once a year.
This site would not be possible without the kind permission from the publishers of Scott catalogs. I have provided a link at the top of every page whereby you can purchase their definitive guide to US stamps. There is no financial arrangement.
You can reach me at firstname.lastname@example.org. I cannot answer every email, but I do read every one of them and take all your comments and contributions to heart. PLEASE DO NOT send a request to identify a stamp.