The Helmcamp Family saved this complimentary matchbook from the Sugar Land Motor Company. I've posted other items about the Motor Company, but you can see from the cover that its official start-up date was 1929.
Prior to that year, the Mercantile Store sold cars to locals. For proof, see the humorous article included in the Texas Commercial News published on November 8th, 1924. Sugarland Industries printed the paper for local readers. (My thanks to the Buddy Blair family for letting me scan this copy of the Texas Commercial News.)