vintage Japanese set of 5 chopstick rests glazed mushrooms

Description

vintage Japanese set of 5 chopstick rests glazed mushrooms.
Found these in a cupboard, so don’t know if they are an old item that is new in box or if someone before me used them. The box shows signs of aging and some damage, but the set of chopstick tests are in great condition. Not quite sure how to describe the color- olive gray brown glaze. There is a symbol stamped on the bottom of each of the chopstick rests. They measure approximately 2”x1”. Condition is pre-owned. Please see photos.