I'm guessing that the four years reference points to the men coming home from World War II, since this ad ran in 1945. I added this one to the Christmas List for memory's sake. I remember my dad having a bottle of Mennen Skin Bracer and a bottle of Hai Karate under the bathroom sink. Never used either of them. Dad wasn't a cologne type guy, not so far as I ever knew. Memories are treasures, though, and mine involves Skin Bracer being one of the first colognes I ever tried. Didn't do much except make me smell like I'd just had a good dose of disinfectant poured over my head. Oh well, that probably was an improvement over 12-year-old-boy stench.