SavantStrike started a thread here inviting everyone who had them to post pics and model numbers (yes, they have model numbers) of their Ever-ready brushes in an attempt to assemble a chart of the brushes, characteristics, and production dates. Although a lot of us contributed a variety of models, none of us could say for sure what the model numbers actually corresponded to. As Thebigspendur said, most of them were a good basic bang for the buck, and taken for granted in their time, but Ever-ready did make a line of slightly pricier badger brushes. Of the ones still around, the bristles may be pretty beat, but some of the handles are beautiful and their retro styles very appealing, and well worth re-knotting. Ever-ready is now owned by Personna ASR, and their web site has a history timeline listing 1915 as the year the first Ever-ready brushes were produced, but that's it. I emailed their PR department asking if they had records of Ever-ready brush production. They still have not replied as of about three weeks later. If anyone has the database you're looking for, I would think they would.
When you get to the fork in the road, take it.