This is a teaspoon Chasaku of Japanese bamboo ware dating from the late Meiji period, circa 1900-1915. There is an etched design on the top that we cannot quite make out as to its significance. It appears to be a woman peering around a tall surfboard shaped form - beats us what that is supposed to be.
A Sago is the SENCHA(green tea) tool used in order to fill a teapot with tea leaves as part of the tea ceremony. Tea scoop (chashaku 茶杓). Tea scoops are carved from a single piece of bamboo or ivory.. Bamboo tea scoops in the most casual style have a nodule in the approximate center. They are used to scoop tea from the tea caddy into the tea bowl. This tea scoop is in very good condition with one small natural bamboo crack. Nice patina from usage. It measures 2.4" wide by 6.4" long and is .9" deep at it thickest.