About 1889 the Libby & Sons glassworks (Toledo) made a short series of tablewares that collectors call the MAIZE pattern, -- quite similar but NOT what you have!! Maize comes in opaque white,"custard" & painted/stained/irridescent. The oil cruet is pictured in Bill Heacock's "Victorian Coloed Pattern Glass,Book 6" where it can be seen to have much more corn (& less green leaves) while having a hand-applied handle (where yours is molded with the body). The emerald green color came into vogue with the Americn table glass industry at the year 1900 ("Dewey"blue had been the color-of-the-year 1898/99), though dark greens may have been prevalent in the bottle-making industry through other ranges of years. As advertising ware about the region of "William Finard & Co" might give it more value than as collectible colored glassware. -BobB