This is a heart-shaped lock holder/sleeve/shell for a small MASTER 131D lock.
The lock should be superglued (or using another adhesive) to adhere the lock to the shell.
Due to the length of the model, this model will require a custom-made longer key. These typically can be purchased at a local hardware store. The keyhole sits approximately 43-45MM from the bottom opening.
Remix of Blank Love Locks for Remixing by DaveMakesStuff for the Thangs Valentine’s Day Contest
The author remixed this model.