Today's find is a tad not safe for work, so if you want to see it in all it's glory, click the blurry version. There is no actualy nudity, but it's a vintage-pin-up-va-va-va-voom-Bettie-Page-style picture. On to it:
Pin-up post card, no writing or markings on reverse.
Found in "Operation Venus" by John Russel Fearn. Published by Scion Limited, no date (1950s or therabouts).