Hello! Judging by the hallmarks, this liqueur-glass was made in Poland between 1920-1931 and MN, probably, a personal mark of the maker. I would be glad to receive information about this maker. Kind regards, Alex http://i91.fastpic.ru/big/2017/0922/0b/7d7d13d81bb7f6ce238583b118f7c70b.jpg http://i89....