From
Jan Lingen. Portuguese
India, D. Joao IV (1640-1646), AR double Tanga (3.94 gm) with S I 'Sao Joao',
1652. These coins were struck at Goa for trade with Ceylon (Sri Lanka).
Countermark 'R' applied at Jaffna after capture of the fort by the Dutch in
1658. Probably to demonetize the Indo-Portuguese currency and covert it to
bullion silver (Singalese 'Ridi')
Wt = 4.09g
Photo from
Portuscalle Numismatica, sale June 2024, lot 349
