Hi Robert. Sure you can use my version
Please let us know later how the indentation's surface looks like vs. the rest of the spine.
On dating, it's a bit tricky as we all know. My guess is that your bolo is 1890s to early 1900s. And it's because I have at least two of such fist bolos, and I'm almost sure that they were made during WW2 or just a little earlier before that era. Now your piece definitely looks older and better than said pieces of mine. Thus my said guess. Hope that others can give their opinion, too.