1926 registered cover to San Francisco with a strip of four 1d’s tied by MARINE POST OFFICE R.M.S. NIAGARA 7 SEP 26 cancellers. A blank registration label with a two line ‘MARINE POST OFFICE’ h/s is on the front of the cover. The back has R.M.S. NIAGARA printed on the flap and a San Francisco SEP 20 1926 arrival cancel. A scarce registered cover from this ship.