The old coin is dated 3804, and comes from Saranthium.
The Old coin is obtained in the Varrock Museum minigame. When a player returns the old coin to display case 45 (ground floor, south-west display), they are rewarded with 10 kudos.
The text accompanying the exhibit in the museum reads as follows:
- "A coin in very good condition with Saradominist markings. It bears the word 'Saranthium', which we have found to be the name of the city being excavated east of Varrock. The numbers on the coin would indicate that it is from the year 3804, presumably from the 3rd Age as the Godwars were coming to an end."