Kinzōgan-Mei (金象嵌銘) – “Gold Inlaid Signature”

• A gold-inlaid signature, often added later by appraisers or historians.
• Used for attributing unsigned (mumei) blades to famous smiths.
• Example: A mumei blade identified as a work of Masamune might have “金象嵌正宗” (Kinzōgan Masamune) added later