Perfins
cover THOMAS COOK & SON: 1915 (26 Mar.) envelope addressed to Singapore bearing K.G.V 4c. with "TC/&/S" perfin tied by double-ring c.d.s., censor seal at left, the reverse with Thomas Cook imprint and handstamp plus Singapore arrival c.d.s.; fine

Details
cover THOMAS COOK & SON: 1915 (26 Mar.) envelope addressed to Singapore bearing K.G.V 4c. with "TC/&/S" perfin tied by double-ring c.d.s., censor seal at left, the reverse with Thomas Cook imprint and handstamp plus Singapore arrival c.d.s.; fine