When the .32 ACP cartridge was introduced, it was immediately popular and was available in several blowback automatic pistols of the day, including the Colt Model 1903 Pocket Hammerless, the Savage Model 1907 automatic pistol, the Ruby pistol and the Browning Model 1910 automatic pistol. The popularity of the .32 ACP in the early half of the 20th century cannot be overstated—especially in Europe. Firearms expert Geoffrey Boothroyd of the UK informed author Ian Fleming, his countryman, that James Bond's side arm should be a Walther PPK chambered in .32 ACP. A significant factor in recommending this round was its near universal availability throughout the world in the 1950s.