I recently digitized the Price List of Material: [Illinois] Springfield Watch Company pamphlet, originally published August 1, 1875. This material catalog covers early grades Stuart, Bunn, Miller, Currier, Hoyt, Mason, and Bates.
In addition, an insert was included introducing the “Bates” grade to the trade, dated August 16, 1875. The new grade is described as:
“Bates.” – Full plate lever movement. 18 size, Sunk second dial. 7 jewels. Exposed pallets. Expansion shape steel balance. Sprung over with hardened and tempered hair spring……. $13.50″