Many of the stamps will be sold in the United States as a collectible - one dealer was selling single-player stamps for 95 cents - while others can be used in the specific country represented.
The six nations that are lending their name to the project do so since sales can contribute to the country's bottom line.
No current NBA players can be featured on a US stamp, since subjects have to be deceased for at least 10 years.
In August, the US Postal Service will debut its stamp featuring tennis great Arthur Ashe, who passed away in 1993.
