Vintage Chinese Double Bevel Dagger

Description

Vintage Chinese Double Bevel Dagger
The origins of this dagger are unknown.
This was once my great grandfather's and i have no idea how he got his hands on it.
It has a button to release the blade on the handle.
Condition:
It is missing two screws that need replaced near the handle on the sheath as shown in photos but those would be easy to replace. Blade has some ware to it but the whole knife is in pretty good condition. The two metal chains are held down in the two spots that need screws.
If you have any questions or would like more photos of a specific thing just ask.