B4V

There is no B4V anchor standard

Lesh68 lists 90 Leo as their B4V standard. 

# No Standard
MK43, JM53, Garrison67, Hiltner69, Cowley72, MK73, Garrison77,
Garrison79, Keenan85, Garcia89, and Houk do not list a B4V standard

Skiff08 did not flag any stars as B4V standards. 

Although Garrison77 does not list a B4V standard, they classify 5
stars as B4V (or variant). The brightest are HD 72436 (V=6.5; B4V) and
HD 153294 (V=8.3; B4V).

For one (not so great) standard:
<B-V>(B4V) = -0.178 (N=1 standard)
<U-B>(B4V) = -0.642 (N=1 standard)

# Standard
HD 100600 = 90 Leo
  B4V: Jaschek78(Lesh68(stan))
  B3: Cannon
  B3V: Ahmed52
  B5V: Johnson50
  B6.6(IV): Kopylov58
  Jaschek64 lists two B3Vs and a B5V. 
  Weak pedigree. 3.5" sep par. A is ~B4V (V=6.3) and B is ~B8 (V=7.3). 
  Mermilliod91: V=5.945, B-V=-0.155+-0.007, U-B=-0.638+-0.011
  => QBV => (B-V)o=-0.178, (U-B)o=-0.642, E(B-V)= 0.023

# Candidate Standard
HD 103079 = HR 4549
  B4V: Jaschek78(Hiltner69),Houk75,Kennedy83
  B4IV: deVauc57
  B5: Cannon
  Jaschek64 lists 2 B4IV and 1 B5V
  Pretty good agreement on B4V type
  1.5" binary

# Others
p Car = HD 91465 = HR 4140
  B4Ve: Slettebak82
  B4Vne: Hiltner69,Garrison96
  B5Vnep: Jaschek65
  Jaschek78 is a mess with 6 different types between B3V and B5III
  Not standard material.

# Stars with majority of classifications being B4V
HD 19736 = HR 950
HD 48383 = HR 2475
HD 56733 = HR 2769  ; Hiltner69, Thackeray73
HR 2871             ; HIltner69, Corbally84 (fainter of 9" cpm pair)
HD 72436 = HR 3373  ; Hiltner69, Garrison77, Corbally84
HD 75112 = HR 3490  ; Hiltner69, Thackeray73
HD 103079 = HR 4549 ; Hiltner69, Houk75, deVaucouleurs57(B4IV) [Sco-Cen; 1.8" binary]
HD 124367 = HR 5336 ; Hiltner69 (B4Vne), Slettebak82(B4Ve), Jaschek92(B4Ve)
HD 137432 = HR 5736 ; deVaucouleurs57, Hiltner69 (B4Vp), Slettebak82 (B4V(e)), Jaschek92(B4V)
HD 161573 = IC 4665 62 ; Gray02,Abt67,Abt64