[VoodooChild]

Bob,

I've been collecting the E121-80 set for a couple of years now. Here's some info that I have (it's been provided to me from some board member experts).

These are cards where only one or a few known examples exist so they obviously can go for crazy prices when they do surface for sale:
Frank Baker (not J. Franklin Baker)
Alexander Gaston
Lee Meadows
Chas. O'Leary
Tom Rogers

These are cards of just Yankee and Giants players that exist with with only Type 2 and Type 3 backs. They can carry pretty big premiums:
Cecil Causey
"Rip" Collins
"Phil" Douglas
William Fewster
Frank Frisch
"Mike" Gonzalez
Harry Harper
Waite Hoyt
Miller Huggins
Carl May (Name Misspelled)
M.J. McNally
Emil Muesel
R. Meusel
Elmer Miller
Arthur Nehf
Roger Peckinpaugh (Correct Name)
Jack Quinn
John Rawlings
Robert Roth
George Ruth
"Bill" Ryan
"Slim" Sallee (Glove Shows)
"Slim" Sallee (No Glove Shows)
Robert Shawkey
"Pat" Shea
Earl Smith
Frank Snyder
Aaron Ward

These cards are not as rare but can still carry a premium:
Johnny Evers (Manager)
Eddie Foster
Walter Holke (Throwing)
Walter Johnson (Hands at Chest)
Duffy Lewis
Carl Mays
Roger Peckinbaugh (Incorrect Name)
Jeff Pfeffer (Brooklyn)
Fred Toney (Trees in Background)
Fred Toney (No Trees in Background)
Bob Veach (Arms Crossed)

These are cards where their existence is questionable in the E121-80 set:
G.C. Alexander (Arms Above Head)
Bill Killifer (Incorrect Last Name - not Killefer)
Ed Roush - position is LF (not CF)
Fred Schupp (Incorrect First Name - not Ferd)
Pat Shea (not "Pat" in quotations)