Value is very dependent on the stamp which you have!
I would recommend that you visit your local library and pick up a copy of a book called "Scott Specialized Catalogue of United States Stamps and Covers". This book lists all stamps which the United States has issued over the years.
You should be able to track it down in that book. If not, you can always visit your local stamp dealer and I am sure they would be more than happy to inform you of it's value.
Just remember that catalogue value doesn't necessarily mean it's worth that amount. The true market value of stamps are at a fraction of their listed value - generally around 60-80% off.
Blanshard Stamp was born in 1905.
Frank Stamp was born in 1905.
Benjamin Hingley died in 1905.
Benjamin Fine was born in 1905.
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Benjamin Ferguson died in 1905.
Franklin D. Roosevelt married to Eleanor Roosevelt in March 17, 1905
Franklin Roosevelt married to Eleanor Roosevelt in March 17, 1905
Albert Benjamin Prescott died in 1905.
Benjamin Blake Minor died in 1905.
Benjamin F. Marsh died in 1905.
Robert Franklin Pennell died in 1905.