Wooden netsuke mouse with a chestnut, mid 19th C CE, now in the collection of the Minneapolis Institute of Art.
More information about the model here:
https://collections.artsmia.org/art/30491/mouse-with-chestnut-japan
About 3 x 3.5 x 4cm (1 1/8 x 1 3/8 x 1 5/8"), but scaled in VR to about 30cm (12").