Watch List notes:

COINS, 錢幣, INDIA – PORTUGUESE INDIA, 印度 - 葡屬, Unknown Location, probably Ceylon: Silver 2-Tangas, Goa, 1640, Rev countermarked with R (unlisted by Scholten; Gomes 17.01). Some scratches, test cut on edge, coin very fine, countermark very deeply punched, extremely fine, rare.
Portuguese Indian coins countermarked by the Dutch East India Company (VOC) for use in their colonies in Ceylon

Estimate: US$400-500