Definition of Deadball Era 1901-1920
Therefore 19th century pitchers are excluded.
According to Baseball Reference there are seven,
but Jack Coombs certainly qualifies in 1910. (Sorry Rob, you are 1 for 7)
Ed Killian, 1904 (331.2)
Ed Killian, 1905 (313.1)
Vic Willis, 1906 (322.0)
Jake Weimer, 1906 (304.2)
Rube Vickers, 1908 (317.0)
Jack Coombs, 1910 (353.0
Walter Johnson, 1916 (369.2)
Babe Ruth, 1916 (323.2)
I should probably call my trivia threads "Evolving Trivia", as I never seem to know if my presumed answers are unique (and they usually are not).
I stumbled upon Willis first and found another question related to him that I can't prove, but.......
Take a look at seasonal totals for Vic Willis pitching for Pittsburgh from 1906 to 1909. The similarity of his totals in these four years I find striking in all categories.
Can anyone find a pitcher with four consecutive seasons that are more identical than Vic as a Pirate.
Wins 21-23
Losses 11-13
Games 39-41
IP 289-322
Runs 84-96
to name a few without getting into his FIPs and WHIPs