The DC found 2 pieces of seaglass with visible letters/patterns!
One looks like part of a bottle, the capital letters AD are raised, as is the squiggly pattern beneath (or maybe they are partial letters, my phone isn't taking very good pics).
The other has a white design, possibly stylised floral?
I'd be astounded but do any of you recognise what they were from? ("why yes, my great aunt Beatrice had a glass vase with that very pattern, it's from a popular range called 'Well why don't you Google'").
Do please add your own photos of seaglass-with-patterns/letters too!