Roof tile stamps have only been a very minor feature of my cbm career as I've only seen one or two. But today, I came across one in a publication and was mightily impressed. I've long known about the cbm powerhouse of East Yorkshire, but this example is outstanding.
It is Agnus Dei - Lamb of God, a pretty typical medieval motif, but to see it on a roof tile is wonderful. It probably comes from a seal and it's speculated that the tile was part of a batch that was 'blessed' or approved by the seal owner. I hope the authors don't mind the scan I took of the back cover of the publication. The details of the Agnus Dei tile are fully discussed.
The full details are:
Archaeological Investigations at Morton Lane, Beverley, East Yorkshire by R McNaught and A Webb, Archaeological Services WYAS Publications, 2005.
The cbm report details are: Ceramic building material by J Tibbles, pages 21-24.
The whole publication can be obtained by visiting this website.
Other cbm includes: tile discs, brick weights and brick net weight/sinker and a ridge tile with finial hole. Unfortunately, these aren't illustrated.