Thank you for viewing. This is an antique lock. It's about 20cm wide. AI Summary: This is a Japanese lock made of iron, called an Inaba-jo (Inaba lock) or Taiko-jo (drum lock). It is believed to have been used from the Edo period to the Meiji period. It was mainly used to lock storehouses, gates, and ship chests. It is sometimes counted as one of the three major locks in Japan. Existing ones are traded as antiques. Type...Other