For 20 years, the folks at American Crew have pretty much owned men’s hair grooming. They’ve dominated men’s education, they’ve ruled men’s trends, they’ve pioneered the products needed to make it all happen. This year, in honor of 20 years of Crew male mastery, they’ve sifted through two decades worth of iconic haircuts, put the finalists to a vote and come up with three looks that have stood the test of time. These cuts are as perfect and on-trend today as they were in 1998, 2007 and 2012, and we would bet our last taper blade that in…