Some of my WWI-WWII pistols. From left to right... CZ-27 Nazi marked, S&W Victory Military and Police 38, Webley Mark 4 38, Colt US Army M-1911 45.
The CZ27 is a Czech manufacture by the company Ceska Zbrojovk est. in 1936 in WWII Czechozlovakia. The pistol is a simple blowback .32 caliber automatic, and holds 8 shots. The gun is single action like any semi-autos of it's time, meaning one needs to cock the hammer back to fire the first shot, unlike modern double actions where a pull of the trigger will automatically initiate the hammer.
The Victory S&W was never a truly standardized sidearm in the US military, although many were issure to airmen as well as troops on the ground. The wheelgun shown is an M&P, a police revolver comandeered for the war effort and given a us ordnance proof stamp (a flaming bomb icon). The gun is a standard double action .38 SW and later became the famous Model 10.
Webley & Scott manufactured the top-break revolver in .38 and .455 since the late 1800's, and it was a popular gun in WWI and civilian Britain all the way until the outbreak of WWII. At that point, Enfield at BSA chose to clone the Webley and created their own, slightly different variation for the war effort. Webley sued to no avail, but the need for guns in Nazi-torn England was so great that Webley ended up producting as many pistols as Enfield. This type of gun was made popular by Indiana Jones.
The John Browning-designed Colt 1911 is possibly the best and most recognized semi-auto pistol in the world. It's simple design is easy to use and feels great to shoot, it's .45 auto round lethal to an enemy in a single shot. The M1911 was used by the US Army in WWI, WWII, Korea, Vietnam, and Desert Storm, currently replaced by the decidedly inferior Beretta 92FS. This model was made in 1918 and still shoots like the day it was issued. It is currently still in production in it's original form by a dozen manufacturers.