Louis' Mixed Drinks with Hints for the Care & Serving of Wines by Louis Muckensturm (1906, p.47)

3 unitsegg — Raw eggsbase
3 dashesVinegar — Vinegarother
1 dashWorcestershire sauce other
  1. Break the eggs into a high-ball glass, add the vinegar and Worcestershire, do not stir, and serve with a teaspoon.

The book says it is often used for breakfast.