It took years of part time work to compile, but the Cooke Compendium is finally published at the Cooke Optics website under tab "About Us," then "Lens History."
Direct link: https://cookeoptics.com/t/compendium.html

This labor of love is dedicated to all large format photographers, especially those of you who have reached out to me via email asking for information about your particular lenses. It's because of you (and eBay) that I was able to gather enough serial numbers to provide a time line on a few given series of Cooke lenses to help you determine when your particular lens was made. The Cooke lens serial number books no longer exist before about 1940.

To my knowledge, this is now the most comprehensive resource for Cooke still lenses made from 1894 through the 1960s.

So, instead of emailing me and waiting for an answer, you can go direct to our website, locate your lens' series number and have all the information you need.

I hope you find it useful!

My Best, Barbara