1898. Envelope (vertical folded) addressed to France bearing Yvert 137, 2c turquoise and Yvert 141, 6c blue with 'Impuesto de Guerra' Yvert 3, 2c violet-brown tied by San Clara double ring in blue with Aix arrival on reverse. Very rare use of the WarTax surcharge on commercial mail to France. (Tax Method: Margin System) (Image)