OT: What were the most Hall of Famers to play in a single game?

[Buythatcard]

I don't know the answer but would love to find out.

I am selling some old Yankee scorecards that I recently picked up. I was shocked to see some of the lineups back in the old days. One of the scorecards that I have was from a game between the NY Yankees & Philadelphia Athletics which took place back in 1928.

There were 10 Hall of Famers that played in the game. I think that's incredible. It got me thinking about the most Hall of Famers in 1 game. I googled my question but have yet to find the answer.

In case you are curious, here are the 10 Hall of Famers that played in this game.

Babe Ruth
Lou Gehrig
Tony Lazzeri
Leo Durocher
Earle Combs
Waite Hoyt
Mickey Cochrane
Eddie Collins
Al Simmons
Jimmie Foxx

What's even more mind boggling was that there were 5 other Hall of Famers on the two teams who did not play in that game.

Ty Cobb
Tris Speaker
Lefty Grove
Bill Dickey
Herb Pennock

There is even more:
Miller Huggins - Manager
Connie Mack - Manager
Bill McGowan - Umpire

So, between the 2 teams (plus the umpire) on this particular day there were 18 future Hall of Famers. Do you think that will ever happen again?