Watch List notes:

BRITISH COINS, Edward III, Silver Groats (4), Pre-Treaty period (1351-1361), London, mintmarks Cross, Lis on breast, Crown, and Cross (S 1565, 1568, 1569, 1570). First watermarked, fair to fine, others very fine or nearly so. (4)
first with ticket which states "Found Thames – bought as Cont[inental] forgery"

Estimate: £100-150