society > communication > correspondence > postal services > payment for postage > [noun] > franking mark in lieu of stamp > instrument for (3)
a machine for stamping letters; = franking machine, n.
One who franks a letter. Also, an instrument for franking postal matter.
An officially authorized machine, introduced by the British Post Office in 1922, used by large concerns for ‘stamping’ letters, etc., with a sign…