Training my eye, and I found this on Reddit:
https://www.reddit.com/r/Katanas/comments/1oor0gw/signed_unno_motomasa/
My initial reaction was one of caution. The flags raised are:
1. The depictions are too colourful. I have not see too many Edo period tsuba with so many colours (outside of the cloisonné designs), so this seemed a little off.
2. The design seems to be back to front. If the kosuka-ana is real, then the simpler design would be on the front, while the complex carving would be on the back.
3. The wear looks odd. At first glance this looks like it should be iron, but the wear reveals a sort of yellowish underlay or white, neither of which look like worn iron patina.
4. The sekigane look like they are decorative rather than functional.
5. I may be biased, but the demon design looks like the sort of thing you see a lot on new tsuba…
What are your thoughts on this? Is it legit?