These and other similar ones with indents on the rim, are often described as Whitefriars knobbly bowls. They never are. I have one of the other similar ones on my Knobbly Blog, which I was told may be Czech, but never have had a firm ID.
But if you look on the blog at least you will see the real deal, and that they are very different. Whitefriars did not seem to deviate from the standard bowl shape and I have never see a W/f with indents on the rim.