I replaced the chain because it was just about at it's wear limit and based on the condition of the drivetrain and lack of wear to any of the internal parts I'd guess it has only seen 3000 - 4000 km max.

I spent a few hours cleaning and polishing the bike as it was pretty grubby when I found it.

Before:



After... with a new chain and freewhweel, new rack, and new grips as well as new cables.