Because postal stationery is similar to covers, used examples can be a useful addition to a postal history collection.
Chile. "DESINFECTADA POR CALOR" (Disinfected by heat). Applied during the cholera epidemic of 1887.
Chile. 1873. 10 centavos.
Sent to London and forwarded to Paris. Used prior to the establishment of the Universal Postal Union. Various transit markings.
Chile. 1911. 2 centavos postal card.
Additional adhesives added to make up foreign rate. Note the use of the brown 2 centavos revenue adhesive for postage.