Richard S. Paul, president of Wiss Jewelers, has announced the appointment of new managers for three Wiss stores. They are: Herbert Davidoff, Newark store; Miss Doris Cederberg, Montclair; and Charles Spierer, manager of the Nanuet, N.Y. store, scheduled to open late this month. Spierer has 32 years of experience in the jewelry business. He manager another New Jersey jewelry store for 16 years prior to joining Wiss. He lives in Teaneck. Miss Cederberg has been with Wiss since 1947, serving at both the Montclair and Newark stores. She lives in West Caldwell. Davidoff has spent 30 years in the jewelry field. He joined Wiss in its Newark store two years ago and later became manager in Montclair. He lives in Fair Lawn.