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Seeking Identification: Unique Flame/Cloud Horimono on Seki Kanenobu–Signed Katana Hello fellow enthusiasts, I have a (WWII-era??) Japanese officer’s katana signed 関兼延 (Seki Kanenobu). The tang (mei) is clearly carved, and the sword has all the hallmarks of a Shin-Guntō from the Showa era (polished steel, authentic hamon, leather-covered scabbard, tassel, etc.). What stands out to me is the intricate horimono on the shinogi-ji (flat of the blade): It resembles a flame or cloud swirl motif—perhaps reminiscent of a flaming jewel (hōju) or kurikara-ken, but abstracted. The engraving is finely chiseled and deeply carved, likely hand-done and not mass produced. I’ve uploaded two photos: one of the full katana and a close-up of the horimono. My questions are: Does this motif align with any known Buddhist or decorative symbolism found in Seki smithing? Is this horimono documented on any Kanenobu blades, or similar blades from other traditions? Could this be a custom personal engraving (e.g. religious, protective), or something added later? If someone has seen similar horimono, could you point me to examples or references? I’d appreciate any insights, comparison images, or feedback from scholars or collectors. Thank you!

I will take a better picture tomorrow. This is the other side

Hello all, This is my first post here, and I would like to ask the group for some help in verifying the authenticity of this one. Any additional information would be appreciated, especially regarding the horimono on the flat of the blade. Thank you.