T.P.O MARKINGS; 1903-1937 range of covers/cards mounted on pages inc. wavy types, double-ring cds types, some with crew codes, 1913 missent postcard showing two different TPO markings, etc. Also 3 unused PPCs of train stations, and an 1897 railway share certificate. Scarce study. (21 used cards/covers, 3 unused) Cross Reference: RAILWAY MAIL, TRAVELLING POST OFFICES (Image)