Lovely vintage Horner staybrite goldtone small swallow bird brooch

Here for sale is this LOVELY VINTAGE 30'/40' UNUSUSAL GOLD PLATED VERSION

OF STAYBRITE MARCASITE EFFECT

SMALL SWALLOW IN FLIGHT BROOCH

(Staybrite invented by the designer Charles Horner 1837-1896)

JUST LOVELY

MEASURES APPROX: 3 CM