None of the pieces are marked, but Northwood often did not mark their wares. This set was probably made by Fenton around 1910.
The item "Fenton/Northwood Cherry Blossoms Water Set Blue Carnival Pitcher with6 Tumblers" is in sale since Friday, July 21, 2017. This item is in the category "Pottery & Glass\Glass\Glassware\Carnival Glass\Vintage (Pre-1940)\Fenton". The seller is "459stockford" and is located in Derry, New Hampshire. This item can be shipped worldwide.