CH 1976-79 SFS 5v FRAMA switch device with date border, white paper with glossy gum, MNH

Switzerland 1976-79 Postal automation
switch franking mark 5v FRAMA switch device with date frame (without time), white paper with glossy gum,
Device 8021 Zurich 21 Annahme VIII/1 5.6.1979, carmine rose - lilac, single value MNH,
Catalog SBK SFS 5v.
Remarks:
As an experiment, the PTT used finely coated paper with glossy gum (V-paper) at the Zurich and Friborg post offices.
The smooth surface turned out to be unsuitable. This caused problems with the paper transport device of the devices,
which is why a large part of these SFS with shiny rubber are cut too short (from the special catalog Schalch 1993/1994).