CH 1976 ATM Type 1, A1-A4, 4 values with First Day Full Cancellation 09.08.76

Switzerland 1976 ATM (Frama stamps)
Type 1 with machine designation A1-A4, First Swiss ATM issue,
4 values with First Day full cancellation 09.08.1976 (A1 Zürich, A2 Bern, A3 Grindelwald, A4 Genève), luxury quality,
SBK 1 I-IV, ZST 1 I-IV, Michel 1.1-1.4, Seitz 1 I A1-A4, Schalch 1 A1-A4 I.

Explanations: Duration: 09.08.1976-26.06.1978, cliché: HELVETIA (big) with license plate 'A1, A2, A3 or A4', type of digits: narrow, printing color: lilac, paper: with fibres, glossy gum, fluorescent: no surface (phosphorescent), impression cylinder: imprecisely moletted, white-greenish-blue security underprint (rosettes), color ribbon: silk ribbon I, printing: Wertzeichendruckerei PTT, Bern.