B7IV

JM53 and Cowley69 lists 16 Tau as the B7IV standard.

MK73 and Houk88 do not list a B7IV standard.

# Primary Standard
HD 23288 = HR 1140 = 16 Tau = Cl Melotte 22 447 (J0344+2417)
  B7IV: JM53,Mendoza56,Cowley69,Jaschek78(Herbig55),Lesh68,Jaschek64(most),GarrisonGray94(B7IVn)
  B7V: Abt78
  B5: Cannon
  Pleiad