Many folks refer to this style as the "mushroom" knob. It required a cut in the underside of the barrel so when guns went back at a later date for say a new cylinder and they installed a newer version extractor rod with the smaller knob it is a very obvious upgrade.
In my .22/32 database, I refer to them as the LERK, the MERK and the SERK.
Large Extractor Rod Knob
Medium Extractor Rod Knob
and
Small Extractor Rod Knob
As stated, the large is the mushroom shape, the medium is shaped like the rod itself but with a slightly larger diameter than the rod itself and the small is the same size as the rod so appears as just knurling on the rod tip.
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James Redfield
LM #497
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