Natal 1866 QV Chalon 3d Strip of Four 1/- Letter to UK

1866 Attractive envelope Pietermaritzburg to England franked horizontal strip of four Chalon QV 3d blue (SG 12) tied numeral 1 cancels. Pietermaritzburg cds APL 5, Devonport PAID 19 MY in red, Leeds arrival cds 21 MY on reverse. Couple minimal imperfections. Scarce & interesting 1/- franking.