The two stamps issued for the Galileo Galilei Anniversary in 1964 were of uniform design and show 30l blood red and 70l violet a portrait of Galileo, after Guido Reni, and facsimile autograph.

Released February 15, 1964

For detailed historical information on Galileo, see Biography.com:

https://www.biography.com/people/galileo-9305220.