Watch List notes:

(g) PCGS MS66 | Switzerland, Gold 20-Francs, 1935 LB, Bern, lettered edge, 6.45g, 5h (KM 35.1; Fb. 499), choice mint state with cartwheel lustrous flaring, in early PCGS 'green' holder, graded MS66 (#8343712).
Provenance
Heritage, 'Weekly Auction' 231304, 24 January 2013, lot 61146 - $390
, ,
https://www.pcgs.com/cert/08343712

Estimate: £300 - £350