Dang!
I've got my work cut out for me putting all of these in the spreadsheet .
You've definitely taken on an ambitious project! I was hoping to find a timetable/chart for Ever-Ready brushes similar to the ones assembled for the Gillette and Schick razors. What you've assembled so far is the only one I've found. Ever-Ready is now part of Personna American Safety Razor, and their website does have a timeline. But it's an entire company timeline that only reveals that Gem and Ever-ready merged in 1912 and Ever-Ready brushes were produced starting in 1915. (please forgive the repetition if you've already seen this) As for the brush production alone, nothing other than that one of their first offerings was a pure badger brush sold along with a gold plated razor for $1.29! I have no clue what $1.29 in 1915 would be equivalent to in today's money, but It sounds like that would have been a luxury item. Maybe some P.R. guy at Personna ASR could dig up some record of the various brushes produced?