The Buffet Blue Book by John H. Considine (1912, p.74)

1 glasssherry base
2.5 dashAbbott's Bitters — The OCR suggests a small dose, adjusted to taste.bitter
  1. Add Abbott's Bitters to the sherry to taste.
  2. Serve as a tonic or convalescent drink.

The OCR is fragmentary but the heading and instruction clearly point to sherry with bitters.

The Artistry of Mixing Drinks by Frank Meier (1936, p.39)

2 dashpeach bitters — Peach Bittersbase
1 glasssweet sherry — Sweet Sherrymodifier
  1. Stir and serve.