Four Bagger (1878)

“Montgomery, the first baseman, plays his position excellently, and was the only man in all the contesting clubs to make a ‘four baggger” at Chattanooga on the 4th of July.” The Weekly Herald (Cleveland, TN), August 15, 1878, p3

Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1ST USE. 1883 (Chicago Inter-Ocean, June 9; Edward J. Nichols).