CH 1934 Franchise stamps 12Bz, Swiss coat of arms and alpine roses, Fiber paper, corrugated paper, no control number, value MNH

Switzerland 1934 Franchise stamps, Swiss coat of arms and alpine roses, chalked fiber paper, corrugated paper, no controll number, value MNH
The stamp is in perfect condition and signed Zumstein on the reverse.
(SBK Portofreiheit 12Bz, Michel 12IIz)..