Halley workshop history https://asiamedals.info/threads/orders-made-by-halley-octave-lasne-paris.28433/.
Grand cross full set made sometime between 1871 and 1890s.
Grand cross.
Gold, enamel.
Size 55 x 55 mm.
Weight /sash included/ 87.7g.
Marked with a French gold hallmark "eagle's head"...
breast star made by halley
eechelaafkrounenuerden
eichenlaubkronenorden
halley lasne paris
halley octave lasne paris
order of the oak crown breast star
order of the oak crown grand cross
order of the oak crown made by halley
order of the oak crown made by halley france
ordre de la couronne de chêne