(Note: Measurements are outside max. dimensions unless stated otherwise).
19th Century : Plain bell foot.
Diam. 21mm. (13/16")
Height top of collar to bottom of shallow dome 23mm. (7/8")
Collar diam. 11.5mm. (7/16")
Nice, solid feel.
Also suitable as a knob.
It is recommended that if selecting screw thread option, a pilot hole is drilled and pre-cut with a steel screw of slightly smaller size before screwing in the casting to avoid shearing.