I feel like I need Columbo on this one: 'Just one more thing...'    I've been trying to find source material that will tell me what the story is with older tsuba that are 'rounded' in the center of the hitsu ana.    Here is an example from a recent purchase: https://japaneseswor...unusual-tachi-tsuba/   Were these indicative of age? Any information you can share? I believe this is an early piece, but it is frustrating that of the few books I own and hours of searchi