The character of Austin Powers was actually based on Harry Palmer, a character played by Michael Caine in a series of spy movies based on novels by Len Deighton. That's why Michael Caine was chosen as Powers' dad in the third movie.
Here's a couple of Harry Palmer trailers:
They're good films, usually described as a more realistic Bond. I own the two last ones,
Bullet to Beijing and
Midnight in St. Petersburg.
Of course Myers exaggerated a bit for Powers.