Watch List notes:

COINS, 錢幣, INDIA – PORTUGUESE INDIA, 印度 - 葡屬, Colombo: Silver Tanga, Ceylon, 16xx, Rev St John, countermarked , C above for Colombo (Sch unlisted undertype; Gomes 05.0x). Coin fine, countermark very fine.
Portuguese Indian coins countermarked by the Dutch East India Company (VOC) for use in their colonies in Ceylon

Estimate: US$200-250