【Cultural and Creative Product 】Sound and Well for a Hundred Years – Disk Lock with Hidden keyhole

NSTM collects over six hundreds of ancient Chinese locks. Most of them have open keyholes and keys can be inserted directly to open the locks. However, some locks were designed with hidden keyholes that are very delicately designed. The keyholes are hidden so well such that many puzzles have to be solved before finding the keyholes. It is a challenging work to find the keyhole.