Unfortunately, Peter, I can tell you really not much about the jug. I have never seen much Imperial Russian glassware in my experiences of collecting. Glassware, in general, makes me "keep my distance," particularly in relation to "reproductions," out-right fakes, etc. There was , of course, a period of time beginning in the latter half of the 19th century, that the "geometric" / "folksy" style was employed in decoration of various items. IMO, the decoration on this jug has faint "echoes" of that style, but I am not familiar (in my limited knowledge) with that shape. I agree that the monogram is the cypher of Emperor Alexander III, but were such marks PAINTED on the bottom? It would seem to me that they would wear away quickly (or could, conversely, be ADDED). Is the mark shown, painted or etched on/into the glass? To me it seems clearly PAINTED. Also, are those scratch marks on the central bottom of the jug? IMO, it is a very strange pattern of scratching/wear. Sorry not to be of more definitive help. AP