I looked this cancel up in Skinner & Eno and in Billig's, but didn't find it-- it looks to me to be like a simple cork cancel inside a circle.
Here is a page from Skinner & Eno-- helps to have these on cover to verify the city/town, I suppose you could call it CR-X 13 from the image here, but I highly doubt it. Seen tons of cork cancels on #65, but I don't think I have one with a cork surrounded by a circle.

Sorry-- I tried! Hope this helped-- Ray