Registered cover franked on reverse with 5 x 1923 10c carmine (SG 143, some of the stamps have faults) tied by unusual OFICINA TELEGRAFICA EL YAS 'Sawtooth' cds's dated 12 SEP with hand drawn 'R No. 67 EL YAS' registration marking on front. Addressed to TURRIALBA with transit & arrival marks. A very rare origination.