The Korbievsky service was considered one of the most favourite and long-lived sets for the Highest Court. It was first introduced in 1823 during the reign of Nicholas I and served at the court for almost 100 years. Additional items were produced from 1840 to 1870. PORCELAIN PLATE FROM THE KORBIEVSKY IMPERIAL SERVICE. Porcelain Factory Kornilov Brothers, Russia, Saint Petersburg, 1861-70.