The Gillette Khaki-sets were made in 1918-19. 3.5 million sets were made especially for the US army to hand out to the troops as part of the regular equipment. Gas warfare was common in World War 1, and if the gas masks were to be effective, the soldiers had to be clean shaven. That is supposedly the reason why the razors were part of the equipment in WW1 as opposed to WW2. The soldiers literally had to shave to stay alive.
It has been speculated that these events are the main reason why safety razors became more common than straight razors after the war, and also the reason why Gillette became a leader in the field. 3.5 million US soldiers simply came to enjoy safety razors and Gillettes in particular.
The razor will deliver a fairly aggressive shave, I'd say pretty much where most men prefer their razors to be, so it is no wonder that it sold in droves.
The razor weighs 50 grams and stand 82 mm high. This razor has great teeth and a fine crack on the top side of the barrel.
This is such a cool read on the history of one such a set. This is a 9 part write-up, very interesting indeed.