From my long-time experience collecting T206 OLD MILL cards, here is a list
which reflects the tougher OLD MILL's in the......
150/350 Series
Alperman
Ball (New York)
Bates
Beaumont
Birmingham
Bransfield
Bresnahan (portrait)
Chase (pink portrait)
Cicotte
Clarke (portrait)
Clarke (with bat)
Crandall (no cap)
Devlin (portrait)
Doolin (portrait)
Ferris
Flick
Isbell
Johnson (portrait)
F. Jones (portrait)
F. Jones (hands at hips)
Lajoie (portrait)
Lake (New York)
Leach (portrait)
Leifield (pitching)
Lobert
Lumley
Magee (portrait)
Mathewson (portrait)
Merkle (portrait)
Overall (portrait)
Pastorius
Rucker (portrait)
Shipke
Steinfeldt (portrait)
Stovall (portrait)
Willis (portrait)
TED Z
T206 Reference
.