Watch List notes:

France 50 Euro Cent Essai Pessac 3rd type undated (minted in 1998) weight 7.68 grammes, 24mm diameter, Reverse upright, UNC and lustrous with a small spot on the obverse, we note French web pages show that average selling prices for the 3rd series 50 Cents range from 300 to 590 Euros

Estimate: 250-350 GBP