The board is 4"x4" but the lip prevents it fitting a Graphic, I'm trying to find what it might fit.
2 or 3 years ago I bought some Speed/Crown Graphic lens boards off Ebay, the seller is/was quite knowledgeable. However of the 4 only one was a Graphic board, and that was for a a pre-Anniversary Speed Graphic. The seller had mis-sold the other 3.