Watch List notes:

Foreign Coins, Switzerland, 5 francs, 1928B, bust of William Tell r., rev. shield of arms, denomination above, date below (KM.38), faint wear, tiny abrasions, original light silvery toning, certified and graded by NGC as About Uncirculated 58
The final date of this type, very rare with a mintage of just 24,000, of which many have perished over the years - one of the truly rare modern Swiss coins.
Estimate: 3000-4000 GBP