Nice shakudo mon menuki by the famous Yoshioka School.
The Yoshioka School was one of the main schools that made items for high level Daimyo and retainer level Bushi. The menuki are very well done as is expected from this school. Interestingly, the shakudo base also has nanako as well. The middle mon of a bell flower is outlined in gold showing the skill of the artist. In a kiri box and NBTHK certificate.
Click on picture for a more detailed look.