No, no, I did not remove the patina. I moved the light souce to flood that area. The Tsuba is very heavy, more so then if it was iron or cooper, etc. I was told by an expert ( who could not read the inscrption) that it was Goto.The medal was gold, silver and something else. ( excuse my ignorance). Thank you for your information .I have many reference books and will look up MINO Kinko and San-Mai Tsuba. Much appreciated...
Roger F