Information on TT&H Cooke Anastigmat lens

[RolleiPollei]

Hello,
I recently acquired a 1914-1915 Kodak No.1 Special Autographic camera with a TT&H Cooke Anastigmat f/6.3 lens. I've been using this camera a lot lately as I'm really enjoying the results. However now that I'm using it I've become very interested in the lens. I cannot find any information on the optical design or even the focal length. The camera produces a 6x9 negative on 120 film. Can anybody here help me out with informant or point me to a good source?

 

[Dan Fromm]

4 1/8" focal length, Cooke triplet.

 

[RolleiPollei]

4 1/8" focal length, Cooke triplet.

Thank you very much! It makes sense it's a Cooke triplet given that it's an actual Cooke.