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"c." = within ten years before or after a date. Dates are for when that mark was first used, or when it was first seen in ads or articles. |
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Objects D'Heart -- see Crystal Brands
Oceania see Royal Craftsmen
Occupied Japan
Mark: Occupied Japan 
Courtesy Sam and Yvonne Mitchell.
Old Crest see LEWIS KIRSCHMAN CO., INC. -- c. 1947
Oleet
Mark: OLEET 
Photo courtesy Jennifer from Jennifer Lynn's Timeless Jewelry.
OLEG CASSINI -- ee Cassini, Oleg
OLENSKA, CHRYSTYA c. Jan. 1966
Mark: Chrystya Olenska for Hattie Carnegie
Omar, Inc.; New York
Mark: Genie & lamp graphic with "Omar" beneath -- from July, 1946.
ORA --see Ralph Singer Jewelry Co.
ORB -- see Bade, Otto
Orientique -- see TRIFARI
ORIGINAL BY ROBERT -- see The Fashioncraft Jewelry Co., Ny, Ny
O.R.I. -- Originalities of New York
Mark: O.R.I. -- 1962 Courtesy Plenty O' Jewels.
Ornella
Mark: Ornella Made Italy 
Photo courtesy Debbie Robinson.
OSCAR CHARLIN -- see Charlin, Oscar
OSCAR de la RENTA -- see de la Renta, Oscar
OSTER, MICHAEL -- c. May 1967
OTIS COMPANY, Providence RI c. 1943
Mark: OTIS 
Photo courtesy Jo-Ann Sturko.
Mark:
sterling Otis 
Courtesy Mary Ann Docktor-Smith
Company was sold in 1970; Mr. Otis died in 1972
OTSBY AND BARTON CO., Providence RI c. 1914
Mark: Bull's eye with arrows pointing to it from either side 
Courtesy Lilly Vittetow
Our Little Darling -- see CORO
PAT SEAL: research files
DOTTY STRINGFIELD: research files
LUCILLE TEMPESTA: owner-publisher of the Vintage Fashion & Costume Jewelry Magazine and club
BOBYE SYVERSON: research files.
A TRIBUTE TO AMERICA by Carla and Roberto Brunialti
AMERICAN COSTUME JEWELRY by Carla and Roberto Brunialti
AMERICAN JEWELRY MANUFACTURERS by Dorothy T. Rainwater
COLLECTIBLE COSTUME JEWELRY by Cherri Simonds
COLLECTING COSTUME JEWELRY 101 By Julia Carroll
COLLECTING COSTUME JEWELRY 202 By Julia Carroll
COLLECTING RHINESTONE COLORED JEWELRY by Maryanne Dolan
COPPER ART JEWELRY by Burkholz and Kaplan
COSTUME JEWELRY A PRACTICAL HANDBOOK AND GUIDE by Fred Rezazadeh
COSTUME JEWELRY (2nd Ed.) by Harrice Simons Miller
EUROPEAN DESIGNER JEWELRY by Ginger Moro
INSIDE THE JEWELRY BOX By Ann Pitman
MASTERPIECES OF COSTUME JEWELRY by Ball and Torem
MID-CENTURY PLASTIC JEWELRY By Susan Klein
MIRIAM HASKELL JEWELRY by Cathy Gordon and Sheila Pamfiloff
OLD JEWELRY by Jeanenne Bell
WARMAN'S JEWELRY 2nd Ed. by Christie Romero
WARMAN'S JEWELRY 3rd Ed. by Christie Romero
