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Cal Hubbard gained fame as a tackle for the three-time NFL champion Green Bay Packers. Upon retiring from football, Hubbard became an American League umpire in 1936.

Along the way he presided over four World Series and three All Star games. His on-field career came to an end in 1951 after a hunting accident saw a shotgun pellet ricochet into his eye and damage his vision.

Hubbard continued in baseball as the AL’s supervisor of umpires, a job he held for 17 years. During that time he codified the roles and field positions for each umpire.

Respected on and off the field, Hubbard impacted the game throughout his tenure. The Hall of Fame arbiter also presided over the AL umpires when Emmett Ashford broke MLB’s color barrier for umps.

Hubbard remains the only person enshrined in both in Canton and Cooperstown.

Shown here is a contract signed by Hubbard. In an interesting turn of events, he agrees “to use Longines watches exclusively for the official timing of all Major League Baseball games in which I participate during the seasons of 1950 and 1951.”

The contract seems curious as there is little use for a wristwatch in a game that does not employ a clock.