I have seen at least two dozen of these marks, and the initials or name are always right side up. Most are under the mark as this one although D M & SONS (a Scottish pottery) are found above the mark. Till & Sons is the only possibility of T & S, but that firm used TILL under the mark you show. That leaves us with an incomplete letter D followed by & S. Geoffrey Godden in his book: Guide to Ironstone, lists the initials D & S on p 234, listing three possibilities:
1) Deakin & Son, Lane End, c. 1833-62 (the most promising). 2) Dean & Stokes, Burslem, c. 1867-68, and 3) Dimmock & Smith, Hanley, c. 1826-33 and 1842-59. He does not illustrate -- nor have I seen a mark used by any of these firms that is like yours; however, he states that "several printed marks occur incorporating the initials 'D&S', sometimes with the county name 'Staffordshire', with description of the body such as 'Stone China'." At this time, that is the best information I have. At least you know your platter was made in Staffordshire -- probably c. 1850s to 1860s -- a time when dozens of British potteries were producing willow pattern on dinnerware for the increasing numbers of the middle class who coveted blue and white.
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