Antique CORO Duette 1930s Brooch Signed Patented Art Deco Dress Clip Very Rare

This Coro Duette brooch is a stunning piece of Art Deco jewelry created in 1930s.  The Duette consists of two symmetrical dress clips that are connected by special detachable mechanism. The brooch is adorned with white/colorless rhinestones. Some of crystals are dimmed and look grey with time. The base is made of the rhodium plated metal and shows wonderful condition for it's age, which is about 90 years. There are some patina and tiny scratches but Duette mechanism is working great and there is no rust on the hinges. There are some cut outs on the mechanism that otherwise is the same as in other Coro Duettes and signed with the same design patent numbers.  The round and baguette-shaped rhinestones create an intricate Art Deco pattern. They set in a "channel-set" setting. This is a stone placement technique used in Fine Jewelry design, when gemstones are nestled into a "channel" or groove crafted within the piece. Chief Designer Adolf Katz used this fine technique to create his marvelous Costume Jewelry masterpieces for Coro Company in 30's.  This brooch is signed as other original Duettes by Coro:  detachable pin back mechanism is signed «Coro Duette Pat No. 1798867» and clips are signed «Pat No. 1852188» Size: approximately 2.2" / 5,5 cm wide x 1.4" / 3,5 cm when fully joined The Duettes are very well-documented and you can find various examples of these 1930's best-selling brooches in various catalogues and vintage collector's books. Please see all of the photos and video as they are the part of the description. Note: Listing only includes one Coro Duette brooch. Other accessories in photos and video are not included. We kindly invite you to visit our shop for more unique antique and vintage pieces.