1923 Haynes Selling Used Cars Marketing Letter. Making it profitable for salesmen to sell used cars. Letter consists mainly of a reprint of Profit-and-Loss-Sharing Plan Has Been Gettting Results for Ten Years from Motor World. Condition: Rusty paper clip and staple, which has rusted onto the paper. Front page has come loose from the staple. Some handwriting on front page. Paper showing age and soiling on back, especially at the fold. See pics.