This mug does not date from 1828, the Royal Tudor Ware line post dates 1930, made by the Barker Brothers pottery. The Barker pottery traded owners a couple of times, The ‘Royal Tudor’ name remained in use by both owners, Grindley of Stoke (Ceramics) Ltd (1978-1982) and Federated Potteries Co. Ltd (1982-1987). We'd need to see a full image of the mug to give you a value for it though.
Re: mug of beer
This mug does not date from 1828, the Royal Tudor Ware line post dates 1930, made by the Barker Brothers pottery. The Barker pottery traded owners a couple of times, The ‘Royal Tudor’ name remained in use by both owners, Grindley of Stoke (Ceramics) Ltd (1978-1982) and Federated Potteries Co. Ltd (1982-1987). We'd need to see a full image of the mug to give you a value for it though.