[Table] header: Series # | Season # | Title | Director | Writer(s) | Airdate row 1 : 410 | 1 | " Snap Decision " | Mark Rydell Category:Articles with | Dick Carr Category:Articles with h | September 17, 1966
row 2 : 411 | 2 | " The Goldtakers " | Vincent McEveety Category:Art | Clyde Ware Category:Articles | September 24, 1966
row 3 : 412 | 3 | " The Jailer " | Vincent McEveety Category:Art | Hal Sitowitz Category:Articles with | October 1, 1966
row 4 : 413 | 4 | " The Mission " | Mark Rydell Category:Articles with | Richard Carr Category:Articles with h | October 8, 1966
row 5 : 414 | 5 | " The Good People " | Robert Totten Category:Articles with  | James Landis Category:Articles with  | October 15, 1966
row 6 : 415 | 6 | " Gunfighter, R.I.P | Mark Rydell Category:Articles with | Michael Fisher Category:Articles with h | October 22, 1966
row 7 : 416 | 7 | " The Wrong Man " | Robert Totten Category:Articles with  | Robert Lewin Category:Articles with  | October 29, 1966
row 8 : 417 | 8 | " The Whispering Tree " | Vincent McEveety Category:Art | Calvin Clements, Sr. Category: | November 12, 1966
row 9 : 418 | 9 | " The Well " | Marc Daniels Category:Articles with  | Francis Cockrell Category:Articles | November 19, 1966
row 10 : 419 | 10 | " Stage Stop " | Irving J. Moore Category:Articles with | Hal Sitowitz Category:Articles with | November 26, 1966
row 11 : 420 | 11 | " The Newcomers " | Robert Totten Category:Articles with  | Calvin Clements, Sr. Category: | December 3, 1966
row 12 : 421 | 12 | " Quaker Girl " | Bernard L. Kowalski Category:Artic | Preston Wood Category:Articles with h | December 10, 1966
row 13 : 422 | 13 | " The Moonstone " | Richard Colla Category:Articles with  | Paul Savage Category:Articles with  | December 17, 1966
row 14 : 423 | 14 | " Champion of the World " | Marc Daniels Category:Articles with  | Les Crutchfield Category:Articles | December 24, 1966
row 15 : 424 | 15 | " The Hanging " | Bernard L. Kowalski Category:Artic | Calvin Clements, Jr. Category:Art | December 31, 1966
row 16 : 425 | 16 | " Saturday Night " | Robert Totten Category:Articles with  | Clyde Ware Category:Articles | January 7, 1967
row 17 : 426 | 17 | " Mad Dog " | Charles R. Rondeau Category:Artic | Jay Simms Category:Articles with | January 14, 1967
row 18 : 427 | 18 | " Muley " | Allen Reisner Category:Articles with | Les Crutchfield Category:Articles | January 21, 1967
row 19 : 428 | 19 | " Mail Drop " | Robert Totten Category:Articles with  | Calvin Clements, Sr. Category: | January 28, 1967
row 20 : 429 | 20 | " Old Friend " | Allen Reisner Category:Articles with | Clyde Ware Category:Articles | February 4, 1967
row 21 : 430 | 21 | " Fandango " | James Landis Category:Articles with  | Don Ingalls Category:Articles | February 11, 1967
row 22 : 431 | 22 | " The Returning " | Marc Daniels Category:Articles with  | James Landis Category:Articles with  | February 18, 1967
row 23 : 432 | 23 | " The Lure " | Marc Daniels Category:Articles with  | Clyde Ware Category:Articles | February 25, 1967
row 24 : 433 | 24 | " Noose of Gold " | Irving J. Moore Category:Articles with | Preston Wood Category:Articles with h | March 4, 1967
row 25 : 434 | 25 | " The Favor " | Marc Daniels Category:Articles with  | Don Ingalls Category:Articles | March 11, 1967
row 26 : 436 | 27 | " Ladies from St. Louis " | Irving J. Moore Category:Articles with | Clyde Ware Category:Articles | March 25, 1967
row 27 : 437 | 28 | " Nitro! " – Part 1 | Robert Totten Category:Articles with  | Preston Wood Category:Articles with h | April 8, 1967 [/Table] Answer this question based on the above table: How many directors were there for series # 431?

Answer: 1.0