This neat old porcelain pair are large and have the imbedded back bolt. They are in used condition. There is some crazing and each knob has some chipping around its base. We guess that this pair has been around since the early 1900s.
Each knob measures 1 7/8 inches across the top. The base is 1 3/8 inches across. Each knob projects one inch from the surface. The imbedded bolt is 1 1/4 inches long and has a square nut.
This pair may not be perfect, but they are charming!