DeAutremont train robbery disaster cover

Cover with cornercard of the American Telephone and Telegraph Co. - the Pacific Telephone and Telegraphic Co. general office in San Francisco, California. It was addressed to Jones & Dona[ldson?], Title Tr[missing], Portland, Ore[missing] and postmarked "Portland / Oregon / Oct 9 / 7 PM / 1923." The address was changed in red ink with strikethroughs of the second and third lines and additions written to the left, which read, "c/o F. A. Clarke / c/o W.A. Mass[missing]." Partial postmark on the back reads: " [...] 6 PM / 1923 / ORE." Then it was subsequently damaged during the DeAutremont robbery of the Ashland and Gerber Train Number 13 at Siskiyou, Oregon on October 11, 1923.