From at least 1899 to 1904, Mathew E. Moran and Ross C. Wolfersperger were gunsmiths in Chicago, IL. One of their specialties was after-market ejectors for Parker Bros. doubles. By 1904 they had come up with a single trigger, ejector double of their own and the name of their business became Moran & Wolf Gun Co. They even outbid Ansley H. Fox for the Garvin inletting machines at the receiver's sale of the assets of Baltimore Arms Co. Things apparently didn't work out and eventually Wolfersperger retired, Mathew E. Moran hooked up with F.P. Stannard as gunsmiths in Chicago, and the after-market ejector business went to Gus Habich in Indianapolis, IN. This from the Nov. 17, 1906, issue of
The American Field --
Here are M & W ejectors on GH serial number 73542 --
This GH has the stamping "M & W. PAT. No. 805" so was likely the next set of ejectors fitted after the forearm in the original post.
Another provider of after-market ejectors for Parker Bros. doubles was C.A. Fischer of Grand Forks, ND.