Polish label?- "I see these "Nabiednych" stamps from time to time but I can never remember what their purpose is. [Rick S.]" "That word means 'for the poor'." [Brian McGrath] via [rs]
NACH PORTO
(overprint on stamps of Liechtenstein): postage dues {After Postage}
(overprint on stamps of Great Britain): Nauru (1916-23)
NAYMAN ISLANDS
(bogus - as is: Aayman, Dayman, Layman, Sayman, Yayman, etc.): British Colonial Royal Wedding - frames from book "Surreal Stamps and Unreal Stickers." [ap]
NE PAS LIVRER LE DIMANCHE
Belgium label (French inscription - to prevent Sunday mail delivery) (1893-1915) {Do Not Deliver Sunday}
Nebr.
(overprint on stamps of U.S.A.): (to reduce theft) {Nebraska} (1929)