Vintage Gas Stove Burner Control Knob. We have reconditioned this knob. There are no cracks, chips or stains - the rear "D" is in very good condition. 

Rear Stem Length: 5/8"

SMALL 1/4" wide rear "D", this is 1/16" smaller then the "Standard Rear D" - please compare closely to your valve stem.

Knob diameter of rear: 1-3/4"