Penrhyn Quarries Ltd.
Slate. A slate cut in Penrhyn Quarry. Most sizes were given specific names, this one being 'Queen'. 'Queen' slates are those larger than an 'Empress' (26in.x 16in.) and can be up to 36in. x 24in. They would be cut for special purposes.
Makers and roles
Penrhyn Quarries Ltd. , producer