cover 1873 (16 Oct.) E.L. (the letter portion detached from the address panel etc.) from Margaret Bult, Postmistress at Du Toits Pan, to the Secretary, G.P.O. Cape Town, marked "OHMS", signed "C M Bult" on face and showing fine sans-serif "DU TOITS PAN" oval d.s.; the contents enquiring the reason for the non return of a registered letter receipt. Photo