Probably won't belive this. I have one. It's from a 1902 vintage Marlin 94 ,octagon barrel,very good condition, a little dark.
It is 8 &3/4 " long and 8 &3/8" inches of full stock between the cut outs for the nose piece and where it fits into the reciever.
I came upon an old 38-40 in poor condition and I have restocked it completely.
For comparison, this is mine.
What's it worth to you?