HARTZ
ET CIE
(Successors to Plisson et Hartz in 1904)
Cockerel Stick Pin 
Gold & ruby
Length: 7.3cm Width: 0.8cm
Makers' mark: ‘H & Cie' with a cat
Numbered: 28852
French. Circa 1905
Literature: cf. Art Nouveau Jewelry, 1985,
Vivienne Becker, p.235
Henri Vever, French Jewelry of the Nineteenth Century,
translated from the French by Katherine Purcell,
2001, p. 1060-1063
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