Take Sign (1932)

“He [a “coacher”] must be alert with signals for every condition such as sacrifice, the drag bunt, the ‘take’ sign, the hit sign, the hit and run sign ….” Hartford Courant, July 8, 1932, p16

Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1ST USE. 1937 (Philadelphia Record, Oct. 9; Edward J. Nichols).