Last glove newsletter featured a story on team glove collecting and cited the Dubow brand gloves as helping out the teamers with names like Jackie Robinson (USA), Don Newcombe, Mel Parnell, and the like.
Sonnetts do the same. While checking through the completed vintage gloves I noticed a Sonnett Larry Sherry glove that brought in over $100 and also a nice Joe Collins. Wilson purchased the OK (Sonnett) brand and sort of used it as a secondary brand like Goldsmith used Draper Maynard after it purchased that company.
So with Sonnett we get names of Wilson endorsers who didn't seem to make it on the Wilson lines: names like "Bubba" Phillips, Albie Pearson, Albie Pearson, Sherry, etc. Some of the Sonnett players were also on Wilson brand but predominantly on Sonnetts.
Sonnett man Brett can probably help out with some more of these.
I would say the Nokona brand is another who helped out with names you couldn't find on the big 4: Rawlings, Wilson, Spalding, MacGregor.