Shakudo kozuka with design of Haboki (羽箒) (feather brush). Nice nanako ground with gold and silver iroe and high relief carving. Mumei. Early Edo period. Looks like Ko-Goto work to me.
This type of feather brush is used in the tea ceremony. When the Kama is removed from the sunken fire pit (Ro), the wooden rim of the fire pit is ritually cleaned with this feather brush before beginning to re-arrange and add more charcoal to the fire. After charcoal and incense have been added, again the rim will be cleaned to make sure there is no ash nor other dust left behind. When picking the Haboki up, the end of the brush will be shortly touched to indicate its higher ranking than other charcoal procedure tools.
Two kinds of feather brushes are used. In winter the left side of the feather is wider than the right side. The Haboki used in summer is wider on the right side. Feathers of an eagle and a crane are most commonly used.
Robert Haynes said the following regarding this kozuka in December 2013, “You are correct again, definitely Ko-Goto. Another beautiful kozuka”.
Proported to be from the collection of Sir William Burrell