About 3 years ago I rescued a Brooks saddle from a derilict bike destined for the tip. I finally got some Proofide for it and before my eyes a remarkable amount of heretofore hidden information was revealed.

First, it's marked on the sides "Brooks Champion Narrow B-17"... Now I know the model

Second, on the underside of the leather, with the horn pointing down, I see an "O" stamped above an "A" on the right side wing. Is this a date code? If so, how does it decipher?