1907 Illinois Central RPO handled envelope.
1880 NEW YORK CENTRAL NYC CANANDAIGUA & BATAVIA RPO HANDLED ENVELOPE
MAY 1936 ILLINOIS CENTRAL USED COMPANY ENVELOPE BRILLIANT ALABAMA
RARE 1870's NEW YORK & OSWEGO MIDLAND NY&OM RPO HANDLED ENVELOPE NYO&W
1925 COUDERSPORT & PORT ALLEGANY RAILROAD LAW & ULYSSES RPO HANDLED ENVELOPE
MARCH 1889 BELFAST AND MOOSEHEAD LAKE BELFAST & BURNHAM RPO HANDLED ENVELOPE
FEBRUARY 1883 BELFAST AND MOOSEHEAD LAKE BELFAST & BURNHAM RPO HANDLED ENVELOPE
