The infamous California stage-robbing, poetry-writing bandit Black Bart was caught because of this.
Handkerchief. Born Charles E. Boles, he assumed the name Charles E. Bolton in San Francisco. He is credited with as many as 28 stage robberies; at two of them he left behind doggerel poems signed Black Bart, the PO8. Wounded during his final robbery, he left behind some personal items including a handkerchief with the laundry mark FXO7, which was traced to a San Francisco laundry.
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