The patent is from October 7, 1941. It is a book piece, appearing on pages 199 and 200 of American Costume Jewelry 1935 - 1950 by the Brunialtis (Mazzotta, in Italian). Flaws: Almost all of the rhinestones are nice and bright but there are a few that have darkened.
There is metal wear on the front, primarily on the tips of the beak and wings. The 2nd picture has 2 spots that look like wear.
There are small scratches on the front and back metal. The clasp looks like it broke at one time and was soldered back on. I have pulled, pushed, and wiggled it. Someone did a very good job. The clasp is also nice and tight.
I have no idea what those extra initials are. If you would like additional pictures of anything please message me. Please look carefully at the pictures. Vintage jewelry may show signs of wear, tarnish, small scratches, verdigris, and other normal age wear. Any obvious flaws are described above.All pieces wrapped and packaged securely. The item "41 Vintage Signed MB Phrygian Marcel BOUCHER 4 Swallow BIRD Brooch Book Piece" is in sale since Monday, July 8, 2019. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Costume\Designer, Signed\Pins, Brooches". The seller is "tmma152" and is located in Cutler, Indiana. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Saint lucia, Barbados, Brunei darussalam, Ecuador, Guadeloupe, Jordan, Cambodia, Cayman islands, Sri lanka, Luxembourg, Macao, Oman, Peru, Reunion, Viet nam, Uruguay, Russian federation.