I found this postcard with stamp?

[Freakn]

I going through some old books and postcard fell out of a book is the stamp valuable? Thankyou

 

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[Mackaydon]

Your stamp is ID-ed as Scott's #300. It is from a series (one cent to $5) printed during the period 1902-1903.
Researching the value, use "Scott's #300" as a reference to see current asking prices and prices actually realized.
Don.......

 

[Freakn]

Your stamp is ID-ed as Scott's #300. It is from a series (one cent to $5) printed during the period 1902-1903.
Researching the value, use "Scott's #300" as a reference to see current asking prices and prices actually realized.
Don.......

I know nothing about value of stamps or current value of stamp?.

 

[Mackaydon]

PS: This should help: https://www.mysticstamp.com/Products/United-States/300/USA/
Don...

 

[A2coins]

Good I'd Don I have boxes of stamps that have been in my basement forever too many to research. That's a nice looking card and stamp hope it brings some big bucks. Tommy

 

[Freakn]

PS: This should help: https://www.mysticstamp.com/Products/United-States/300/USA/
Don...

. Thanks for the info I guess the postcard stays back in the book!��

 

[leonedimare]

Nah. Sorry this is a very common stamp used commonly during the period. The postcard is likely worth more as a collectible.

 

[Willy Garrison]

I agree with previous commentators that the greeting card seems to be of great value. I would crawl around the Deltiology forums with this card.