Wood (possibly walnut), glass
Overall: 6 7/8 x 6 7/8 x 7 3/4 in. ( 17.5 x 17.5 x 19.7 cm )
Rectangular wooden box, two sides bracketed at top to hold I-shaped wooden bar with hole in center that slides across; molded green glass sleeve.
Due to ongoing research, information about this object is subject to change.