Watch List notes:

France - Royal (987-1793) - Louis XIII (1610-1643) - Ecu d'or 1637-S, Troyes (KM41, Gad.55/R, Fr.398) - Obv: Crowned arms / Rev: Lobed and floriated cross, mint mark at center - Gold 2.89 g. - clipped, a.VF, rare coin