I think the stock was repaired previously by just gluing the broken piece back onto the bottom of the stock. It is very sturdy and although the crack seems to go all the way through the piece does not budge when I pry on it. I thought about routing a channel into the stock and then gluing a walnut slat into the channel and sanding it down. I waited on that evolution until aftger I finished the stock to see just how obvious the new wood is.
I finished it with teak oil and it turns out the match is quite good.
I may try the repair using a walnut slat.
My reading of history convinces me that most bad government results from too much government. Thomas Jefferson