Take it to your local coin collector or antique/collectible shop. You can also sell it online on a site such as eBay or Craigslist. eBay would be the better choice.
I can find no reference to a "unique" 1913 Penny from any country.
Penny Illustrated Paper ended in 1913.
If you mean is it legal to sell and old penny? yes.
A US cent dated 1913 is a Lincoln cent and the word Liberty is also on the front of the coin.
The value very much depends on the grade (condition) of the coin. Most are low grade coins that sell from 25 cents to $2.00.
1-4$
What penny! :) Ebay most likely. Put on the description "lucky penny"
Most coin dealers should be able to sell you a 1936 Australian Penny.
Between $1.60 and $17.
In circulated condition, about 3 cents.
List it on eBay.
On E-bay!