Fine antique landscape painting of cows river etc circa 1840

Dating to circa 1840and measuring 10.5” x 18” and 15.5” x 23” including itsoriginal heavy gilt frame. This is a good quality oil on board depicting cattle in a river with bridge and mountains beyond, possibly Wales? I can find no signature but it is signed on a old label on the reverse “E.H. Dixon” who exhibited at the Royal Academy in the 1840s. Apart from slight wear to the frame it is in ready to hang condition. It is large and heavy so please check my postal charges.