cover 300r Orange & Green (78), used with 100r Green (72), on front of 1881 registered cover to Argentina, bold segmented cork cancels, 'RIO DE JANEIRO' double circle handstamp in red and matching 'Registrado' oval handstamp adjacent, Buenos Aires backstamp, 300r adhesive has couple nibbed perfs., cover opened-up to display both sides, very fine, franking represents 200r postage and 200r registration fee not illustrated est.