7 mil clear acetate instruction or score card cover used on a few Williams/Bally pinball machines.
Reference:
20-9045-1
Select manufacturer to view game compatibility

Acetate instruction/score card cover 3.25 x 6 inches (82 x 152mm)

Acetate instruction/score card cover 4-1/4 x 6 inch

Acetate instruction/score card cover 2-1/8 x 3-7/8 inch

Acetate instruction/score card cover 2.25 x 4 inch

Acetate instruction/score card cover 2-1/4 x 6 inch

Acetate instruction/score card cover 3 x 5-1/2 inch

Acetate instruction/score card cover 3 x 5-3/8 inch

Acetate instruction/score card cover 3 x 6 inch

Acetate instruction/score card cover 3-1/2 x 6 inch