Los 6763
"144" Postage due charge mark on partly prepaid double rate letter postmarked Barcelona (Spain) October 29th 1860 and sent to Stockholm. A new French-Spanish convention made it possible to prepay the international rate between France and Spain to destination, this was refused by Spain for letters in transit to France. For this reason this letter was prepaid to Spanish/French border (12 quartos) and was then sent unpaid to Sweden.
