Sheet  20, Old Series 1". Somerset, Bristol Channel, Quantocks, Glamorgan, Topography 1809, issued 186? (not clear), no geological dates, first edition. This is a very early map where the date was omitted before the conventions were established. Portlock on west edge, Bridgewater on east, Barry on north shore. Hand-coloured engraving, 68 x102cm, flat with old centre fold, clear plate marks, library blind stamps, stencilled number in corner. Very slightly soiled at edges, otherwise clean and bright. In very good condition.