Stunning Givre Glass Domed Brooch by Continental

Stunning domed pin brooch, vintage late 50s-60s, unsigned with some construction characteristics typical of Sherman's craftsmanship ( please see the last photos of signed pieces) , based on my research it's made by Continental ( please view the last photo of an identical signed brooch found on line) , the brooch is made out of givre glass accented with aurora borealis crystals prong set in rhodium plated metal, in great pre-owned condition, some minimal wear/aging signs in the reverse next to the clasp, not visible when worn. Measurements: 6x4 cm, 3 cm elevated.