SA 75th anniversary in Switzerland + various anniversaries
Issued 05.03.1958
Postmark: Bern (German text)
Cachet: Hand stamp (green/brown)
Stamps: Block of four (SG 590)
Size: 162 x 114 mm
Remark: Blocks of four series before 1960 are very rare, especially with French and Italian PM. Cat value for full set with four blocks = CHF 120. These covers are often massively above catalogue prices.