There aren`t too many classic cocktails calling for celery bitters, but one that is mostly credited is the Forth Regiment Cocktail which was popular in the late 1900, and considered good enough to go into Charles H. Bakers Gentleman Companion in the 1930`s. Celery Bitters are a bit weird, but once applied in the right way to a cocktail it has the power to become the magical ingredient as Jamie said so nicely in this little video.

Fourth Regiment Cocktail

Ingredients:
30 ml (1 oz ) Rye Whiskey
30 ml (1 oz ) Sweet Vermouth
1 dash The Bitter Truth Orange Bitters
1 dash The Bitter Truth Creole Bitters
1 dash The Bitter Truth Celery Bitters
Lemon zest

Instructions:
Stir all ingredients well with ice. Strain into a chilled cocktail glass. Garnish with Lemon twist.

TIP: add lemon twist to the glass before pouring the cocktail to add the most robust lemon flavor throughout the cocktail.