Museum piece possibly Ancient Blue Green Cloisonné Champlevé Enamel Ring

Description

rare collectable extremely old
(possibly Ancient),
Blue and Green Cloisonné Champlevé Enamel Ring!
this is truly Museum piece!!!
please see photos as part of description, more photos available.
shows extreme heavy age/patina! even holes in some areas - pls see photo #4 top right. loss of enamel in some areas - pls see photos. the band looks to be adjustable.
my apologies, the exact origin, age is unknown.
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thank you