Tiny metal padlock with two tin keys - the lock is marked Hong Kong, so this is around 50 years old. Still works, though you probably could break it without a lot of difficulty - so I wouldn't use this except for fun, it won't stop anyone who's determined.
The lock measures 1 1/4" long top to bottom. It's spotted with tarnish and verdigris, looks even older than it is. Just the thing for a tiny treasure chest or time capsule, or to lock up your diary!