Sakura Viewing

Edo period (1615-1868) 

Mumei (Unsigned)
The image is a representation of the mat or screen used when sitting in the parks to view the sakura. The sakura blossoms arc over the top of the tsuba. 

This depiction seems to be fairly common with a number of other tsuba having very similar depictions of a practice that started to be common in the 19th century.