One of the most interesting specimens in the vintage pen world: the Waterman Prohibition Flask! This 1920 Prohibition Flask is an extremely rare piece – that is an understatement! Made to look exactly like the Model 20 Safety pen (the largest pen in Waterman’s model line at the time). Allowed folks to carry booze without being suspected of breaking the law. Complete with perfect barrel imprints and G/F pocket clip. Wonderfully rare and collectible! New-old-stock. Mint.