Bob, thanks for your thoughts. We both agree on the first kanji, 天 "ten". I went back again and looked at the second kanji -- it comprises two parts unlike "mon" and "shō", so I don't think it could be 文 [Tenmon] or 正 [Tenshō]. I am fairly certain (after manipulating the shadows/brightness) that the second kanji has a イ "nin" radical, and to its right I can see the 口 "kuchi" with 木 "ki" below it.
I'm still thinking it is 保 [Tenpō]
Do you have a way to photoshop the nakago and play with the shadows/brightness? If so, please give it a try. It is a hard kanji to read .... but easier than the last two
Cheers!
--Guy
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