Actually, by 1910 the ejector rod knob was one piece with the rod. The factory did an excellent job of forming both the mushroom and barrel shaped knobs to look as if they were a separate piece. Prior to 1910, they were threaded on the rod and case hardened. My eye says the picture of the OP's ejector knob has a polished front section and the retaining pin in the lug could be in-the-white as well. Pictures uploaded to the Forum are low quality (maybe 50kb) so you cannot enlarge them to see details. Also, I think the owner's pictures may be lower exposure, showing dark shading where it does not exist. Proves there is nothing like in-hand inspection.
The LERK moniker goes back to post WWII collectors seeing early guns had a barrel shaped knob and later guns had a knurled rod end. The barrel shaped knob was named the LERK, but did not take into account the larger mushroom knob, hence confusion about pre-WWII and post-WWII configurations.
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