Around 1991 the Lomonosov factory used a burgundy or red mark. This mark varied in color intensity from a dark mark to a light one. (See some examples below.) If the mark was in English, then the piece was for export. In the absence of an English mark, it an item could either be an unmarked older piece or was intended for domestic sale in Russia. The red LFZ monogram export backstamp with red "Made in Russia" used from 1991 to 2002. After 2002, marks were in red or blue LFZ monogram and "Hand Decorated", 1744, St. Petersburg, Russia" together with an occasional holographic sticker with "export quality" and the factory monogram on them, probably added by importers. In 2005, the stockholders of Lomonosov Porcelain Factory resolved to return to their pre-Soviet name, the Imperial Porcelain Manufactory. Generally, especially in tableware, the quality of production remained consistent.
Below are several marks from the past 35 years or so. From left to right, they are 1) USSR mark, pre-1991 2) mid-90s burgundy mark 3) mid-90's bright red mark 4) logo only (domestic market) 5) Red mark (1C stands for "1st quality" and laurel wreath for special pieces) 6) Blue logo 1744, St. Petersburg, Russia & Hand Decorated and 7) Blue IMPERIAL PORCELAIN logo with double eagle, date and St. Petersburg.