Watch List notes:

Bolivia (4) 20 Centavos 1883 EF mintmark (transposed) Fine or slightly better, Extremely Rare (Krause states 3-5 known), 500 Bolivianos 1975 150th Anniversary of Independence, 250 Bolivianos 1975 150th Anniversary of Independence, 100 Bolivianos 150th Anniversary of Independence UNC or near so and lustrous

Estimate: 60-80 GBP