What was that cocktail Don Draper made?

In the other night's episode of Mad Men, Draper was behind the bar making a very impressive-looking cocktail. He tosses a sugar cube in a glass, adds a few dashes of bitters, and tops it off with some rye and maybe club soda.

I've been racking my brain to remember the name of the drink but I can't put my finger on it. Anyone know what it is?

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