Beautiful plate! It appears to be in the transfer style made famous by the French factory of Criel et Montereau. As to the Spode impressed mark, if the mark is in upper and lower case letters "Spode" it would have been made before 1805 but if it is in upper case letters "SPODE" it could have been made as late as 1820. By the way, from the image of the mark that you posted, the pottery body appears to be creamware however, if there is a translucent bluish tint to the glaze where the foot ring meets the underside of the plate it is pearlware instead.
After much searching in one of my Russian language references, I found an 1870's listing for the Fabika Masslenikova in the Moscow Gubnaria. The mark for the factory depicted on a plate is exactly like yours with the circular star mark for Maqselin above the word "SPODE" over the number "15".