The Swissmint Patterns. 20 francs 2026 B, Bern. 125 Years of the Aero Club of Switzerland. SILVER PATTERS. Propeller blade with "E" symbol for ESSAI. Value below / Cockpit view with history of aviation unfolds in segments. 20,00g. NGC PF69 ULTRA CAMEO. (8806431-009). Extremely rare, only three species struck. Technical information from Swissmint: For the definitive strike, the clouds have been removed and repositioned so that they are not split up. During the first sample strike, both stamps (obverse and reverse) were produced using a laser. However, for the coinage series, the obverse stamp was made using the traditional method (die-striking) and the obverte stamp was laser-engraved. For the reverse, the aim was to reproduce the same type of brilliance as the first piece in the series, whose stamps had been made using the traditional method.