Jacobus Cornelis Wyand Cossaar Jan Cossaar; Jacobus Cornelis Wijnand Cossaar; Ko Cossar; Cornelis-Johannis Cossaar ( 1874 - 1966 ) was a Dutch painter and watercolorist. Jacobus Cornelis Wyand Cossaar s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 518.71 USD for SAN PIETRO, ROME, TOGETHER WITH FIVE OTHER WORKS in 2003 to 9545.7