(pre-adhesive handstamp): Swiss {Fischer FERNEY}. (Numerals are believed to indicate the amount due in 'kreuzer' to the Swiss mail contractor Fischer. Similar marks are found without numerals on internal mail) (1823-27) cf. 'F.D.'
F.H.
(pre-adhesive handstamp): Dutch (in black). (Carrier mark for NIJMEGEN) (1871)
F.K.M.B. (or) F.K.M.P.
(pre-adhesive handstamp): Swedish {Fack Med Bevakning av Postiljon (Goods wagons with guarded letter boxes)} (1913-49)
F.M.
(overprint on stamps of France) {Franchise Militaire (free-franking privileges)} 1901-39
F.N.F.L.
(overprint on stamps of French colonies): {Forces Navales Francaises Libres (Free French Naval Forces)}. (1940-45)
F.N.N.
(pre-adhesive handstamp): Irish {Forenoon}
F.O.
(pre-adhesive handstamp): British {Foreign Office} (1828)
F.P.
(pre-adhesive handstamp): Danish - (in circle) {Fod Post (Foot Post of Copenhagen)} (1856-57)
F.p.K.
(pre-adhesive handstamp): French {Franco or France par KEHL} (1807-12)
F.P.M.
(pre-adhesive handstamp): French {France par MASEYK}
F.p.M.
(pre-adhesive handstamp): French {Franco or France par MANNHEIM} (1808-15)
F.P.O.
(pre-adhesive handstamp): British {Foreign Post Office}
F.R.
(pre-adhesive handstamp): French - (in frame with cost in French) Mark of entry