PB COASTERS ca. 1960 hr>A set of absorbent woollen coasters produced in Wales by the Cambrian Woollen Mill in Llanwrtyd Wells, the smallest town in Britain. Made from 100% Welsh wool, the coasters were sold at Harrods and other fine stores until 1969. Cambrian Mill is notable for having employed disabled workers since 1917. Many are Welsh victims of foreign conflict; all are members of PB.