Has anyone ever sold an old board game called "Anex-A-Gram?" [View all]

For some reason I picked it up at the thrift shop yesterday and from what I can gather it's an early version of "Scrabble." It was made in 1938 by The Embossing Company of Albany, NY. This one is in really good shape with the exception of a bit of wear and crud on the box cover that I hope will clean off. My "spidey" sense is telling me it might have some value. Thoughts?