Charleston, S.C./11 May/10/Havana. Blue cds on 1854 folded letter datelined Havana to Baltimore, endorsed "Pr. Isabel", fresh and Very Fine, the Isabel was under U.S. contract at the exorbitant rate of $60,000 per year for semi-monthly trips on the Charleston-Savannah-Key West-Havana route. Estimate  $150 - 200. $0 (Image)