Tsuba, birds, flowered branches, and a surprise.

[Yves55]

I bought this tsuba in 2016 and handled it from time to time.

Today I looked at it again and had a real surprise 

Here is the iron tsuba:

 

 

Dimensions:

7,92 x 7,90 x 0,54 cm.

Weight: 88 gr.

 

You found the surprise?

I'll send the answer below.

 

[Yves55]

And here is the anwer:

The feet of the flying bird are inlaid with red copper.

 

 

Is this practice known and can the mumei tsuba be identified by this feature?

 

[ROKUJURO]

Yves, 

without these copper feet I would have guessed KYO SHOAMI, but you never know by whom and when additions were made.