Hi Ken - this aspect of Northwood's glass is not something I have studied closely, and I have not done any research into it myself, so I certainly make no claims here. I'm going by the section in "Harry Northwood The Wheeling Years" (Heacock, Measell, Wiggins) p 172: "The first Ivory articles in 1914 may have been gold decorated, but a brown stain was introduced within a few months, and blue and pink backgrounds were available somewhat later."
Same book, p 68, notes that Grape Arbor was made after 1914 in Ivory Glass "including some interesting pink stained items" which are then referenced by illustration to figs 764-765 on pages 128-129. In those illustrations are photos of nutmeg stained Grape & Cable items (including a plate like the one I showed earlier in this thread) and several pink and blue stain items (including a G&C punch bowl with blue stain and a Grape Arbor pitcher with pink stain that appears to be the twin to yours). The explanatory text notes: "These Grape and Cable items c. 1914, have the original decoration, a brown stain called 'nutmeg' today. Other articles may be gold decorated or have pink or blue stain."
Glen