You're buying the chip breaker shown in the photos.The chip breaker measures slightly over, 2-5/16" in width, and almost exactly 5-3/4" in length.
This chip breaker is most likely from a transitional plane.
The depth adjusting slot on this chip breakers is approximately 3/4" higher than Stanley metal planes ( 4-1/2" from bottom edge).
The chip breaker is quite clearly marked:
L. BAILEY'S
PATENT
DEC. 24, 1867.
The chip breakers in good working condition, although it does have mild pitting and some slight surface irregularities.