This is a vintage control knob. This was in a box of hundreds of 1920-30's vintage stove knob/dial we have had for years. Every now and again we still get 'stumped' - It is bakelite, that often dates an item and would suggest various applications. We have no idea what this knob went to, or if it is even a vintage stove knob. If you know please let us know. 

It is very solid, no chips or cracks, deep brown bakelite, it does have a very small set screw hole on the side of the stem. The insert is round and approximately 3/8" in diameter and has inner threads. Set screw not included.

MEASUREMENT:  top length 1-7/8"  /  top width 1/2"  /  stem 1/4""