Used 1857 to 1862. WORCESTER Present mark. CAUGHLEY. SHROPSHIRE Established about 1751. CAUGHLEY. SHROPSHIRE An early mark in blue. COALPORT Established between 1780 and 1790. COALPORT COALPORT Present mark. STAFFORDSHIRE Established in 1791 by Mr. Thomas Minton. STAFFORDSHIRE Present mark. LAMBETH and BURSLEM Doulton & Co. STAFFORDSHIRE Brown-Westhead, Moore & Co.