Posted By: Steve Gridley Thu, Jul 01, 2021
Many of this style lock were made in the Yunnan Province in the early 20th century. Some claim they are older borrowing from Roman locks. The "1963" carved into the lock may give some indication as it looks to be carved by someone not as familiar with western characters and could be original to the lock.
The key seems to have been on a key ring a while as evidenced by the wear to the hole. I would approximate the brass key would have rubbed against a steel key ring for approximately 20 to 30 years for that amount of wear, longer against softer materials. Sorry I can not help with the inscriptions.