B2IV

JM53 lists gam Peg (HR 39) and del Cet (HR 779) as B2IV standards, and lists
a non-standard NGC 2362 46 as B2IV. 

MK73 lists gam Peg (HR 39) and zet Cas (HR 153) as B2IV standards

Cowley69, Houk88(citing MK73), Walborn90, and GrayNstars all list gam
Peg as a B2IV standard.

GrayNstars lists Gam Peg as their B2IV Steward Obs. and DSO standard.