From records the Aynsley Portland range of clocks were introduced in the 1980’s71mma

Portland was the name given to the second pottery John Aynsley (II) built at Longton.Staffordshire in 1861. The Portland Vase 1790 produced by Josiah Wedgwood a replica of the first Portland Vase was a subject mater of great interest Portland stone from Cornwall is one of ingredients of clay. (sulphate of barytes 150, china clay 35, blue clay 45, flint 35, gypsum 6, and Cornish stone 50)