Natal 1873 QV 1/- Small Format Letter to England

1873 Small format envelope Durban to England franked single QV 1/- green, curved POSTAGE ovpt in green (SG 59) paying mail steamer rate. Adhesive tied by numeral 2 cancel. Light Durban cds MAR 10 1877 on front; no other markings. A trifle soiled, attractive. F-VF.