"Narodni Podnik" means "National Enterprise" and is the suffix given to nationalized industries under communism in Czechoslovakia. I think you've already figured out the meanings of all your stampings, but I'll confirm them for you.
All pistols were made in Strakonice until 1955 or so... or so it appears from what I've read over the years. It was only in 1955 that pistol production was transferred to Uherzky Brod, and the Stakonice factory was then used to build motorcycles and other CZ branded consumer goods.
The 765 in the circle is the caliber, meaning that this gun is chambered for 7.65 Browning, which is also known as .32 ACP.
The "Made in Czechoslovakia" stamp means that it was made for the American civilian market and exported here legally before the Cold War froze commerce between the East and the West.
Scott