Too many variables. You need to fully identify the stamp you are interested in, some things to figure out:
What was the country of issue?
Was the stamp canceled in 1913? or does it commemorate something that was made in 1913 and has that date in the design?
What condition is the stamp in?
Is the stamp used or look like it just came from the post office?
Consult a stamp catalog online or at your local library.
To many variables. You need to fully identify the stamp you are interested in, some things to figure out: What was the country of issue? Was the stamp canceled in 1913? or does it commemorate something that was made in 1913 and has that date in the design? What condition is the stamp in? Is the stamp used or look like it just came from the post office? Consult a stamp catalog online or at your local library.
Between $1.60 and $17.
Unfortunately the initials killed the collectible value of the coin, it's face value.
Without knowing more about the stamp, it's impossible to answer. You need to include the country, date (if you can find it) and what is on the stamp (who or what is on it). Also a rough idea about the cindition would help in pricing the stamp.
In 1913 Wheat Penny value at an average of $1.25, one in certified mint state.
In average circulated condition, value is 50 cents to $2.00
I can find no reference to a "unique" 1913 Penny from any country.
The last Indian head pennies were minted in 1909. All cents from 1913 carry the familiar portrait of Abraham Lincoln.
Please check your coin. King Edward VII died in 1910 and King George V was on the throne in 1913.
The value of a 1913 silver wheat penny, also known as the 1913-S Type 1, can vary significantly based on its condition and rarity. While most circulated examples are worth a few cents to a couple of dollars, uncirculated or rare variants can fetch much higher prices, often ranging from hundreds to thousands of dollars at auction. It's important to have the coin appraised by a professional to determine its exact value.
The last year of issue for Indian Head pennies was 1909. If it's a US 1 cent coin It's a Lincoln cent. The 1913 date has a retail value of $35.00 in MS-60.
Penny Illustrated Paper ended in 1913.