QUEZAL ART GLASS SHADE

An iridescent blue on blue base glass QUEZAL Art Glass shade.
Extremely rare...possibly a custom unique set of shades manufactured with a deep blue translucent base glass then blue/purple iridescence applied to the exterior and interior with a standard 2-1/4" fitter rim.
Engraved on the fitter rim at 12 o'clock: QUEZAL
As a note: Tiffany Studios manufactured a similar rare color combination
in art glass shades.