Like many of New York City's Manhattan variations, the rye whiskey-forward Fort Point is named after the Boston district that was home to the bar where...
That was right out of the gate when they opened in 2008 (I had it in October 2008) as their one calling card drink as they didn't have a menu. It might have been the inspiration for the bar's 1919 Cocktail that got a bit more traction appearing on menus across town (rye split with Old Monk Rum, double the Punt e Mes & Benedictine, and addition of mole bitters).
Many thanks, Frederic. I've amended the above and added your note about 1919. I'll also be sure to add the 1919 to Difford's Guide and link with this cocktail.