Vintage micrometer, used by watchmaker’s and watch repair people to measure the tiny parts used in mechanical and automatic wrist watches with extreme accuracy and precision. This tool was made by the Central Tool Company of Rhode Island, USA. It features a milimeter (mm) / centimeter (cm) scale (0-250mm, 0-25cm). Model #13RL “Metric” in Satin Chrome with Friction Stop and Locknut. It has some staining/oxidation, which will probably clean up well, or it will work great just the way it is.
These tools are incredibly expensive to find nowadays. Most of the reasonably priced versions are made in India and China. When you need to measure things this small, it pays to have a quality tool!