These were brought into the mine by miners to detect deadly gas. If the bird died the miners would have to leave the area.
Cage is in very good shape. Has feed trough and water barrel. All wood construction. The bottom slat is removable for cleaning and removing bird.
6 1/2" long x 4 3/4" wide x 6 1/2" high The color is brown. Cage has one wood bar missing.