Early Coro jewelry, (as early as 1901), is marked "CR", (stands for Emanuel Cohn and Gerald Rosenberg.) Coro production ceased in 1979, except for Coro, Inc, in Canada, which was still operational in 1990. The "Coro" mark, which is most common, was in use since 1919. "Coro Craft" mark was used since 1937 and was originally used on higher quality pieces. "Corocraft (one word) was used after WWII. The Pegasus mark was used after the war. Coro used many additional marks. Matching sets were generally more popular in the late 40s and 50s and the WWII vermeil era was generally more about pins and brooches. Often they came in pin/brooch/duette + earring sets but rarely as full parures. Coro's most collectible items are: early jewelry, duettes, jelly belly figurals, Mexican sterling, some CoroCrafts, most Vendome jewelry and sets from 1930 to 1950.