I have no idea what the part number is. It does seem to work normally and move freely. It is a quality used dial indicator.
What you see is what you get with this one. These are from onsite the measuring gage calibration department at a large "Fortune 500" company that was closing their local production facility. Ask if you have any questions!
For idea of scale, the "Squares" on mat in picture are 1/2" x 1/2" (although may be distorted slightly depending on angle picture was taken from). Please ask if you have any questions! The item "Starrett Last Word Dial Test Indicator See Pictures" is in sale since Wednesday, September 29, 2021. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Metalworking Inspection & Measurement\Indicators". The seller is "my_brain_fart" and is located in Spring, Texas.This item can be shipped worldwide.