The ancient coin is obtained in the Varrock Museum activity by cleaning an uncleaned find (note that players might not get it in the first try). When a player returns it to display case 44 (ground floor, middle row, case to the west), they are rewarded with 10 kudos. It cannot be obtained after it is returned to its display case.
A battered and bent coin with Zamorakian markings. It bears the word 'Senntisten', which we believe to be the original name of the city, Saranthium, before it was rebuilt by those loyal to Saradomin. Partial numbers on the coin would indicate that it is from the year 3740, presumably from the 3rd Age.