During this time, Waterloo became one of the “big four” manufacturers along with Fairbanks Morse, Hercules and International Harvester. The Deere and Company Collectors Center has provided the following list of serial numbers for the "Waterloo Boy" engines. A few of the companies selling Waterloo engines added a letter in front of their serial numbers.
From 1906 through 1918, Waterloo engines were sold by at least sixty-seven companies with each having their own ID tag attached. Production in most, if not all, years was seven days each week.
WATERLOO GAS ENGINE COMPANY HISTORY 12 JUNE 13 The Waterloo Gasoline Traction Engine Company began business in 1893 with the intent of building gasoline tractors.Sales were slow so the company reorganized and engine production began in 1895.