Stampless cover with manuscript 'From William H Francis, Rail Road Department, Central Santa Fe, Macoris R.D.' return address on reverse. Unfranked (assuming it was meant to be official mail) with S.P. MACORIS cds however the cover was deemed underpaid and taxed with small 'T' in circle and manuscript '10 cts'. Addressed to UK with '1d TO PAY' marking struck on arrival with GB 1d red 'Postage Due' tied by BRISTOL cds. Very unusual.