Yes, your plate was definitely produced at the British Anchor Pottery, that moved to Stoke-on-Trent from Longton in about 1872. I show a 16.25x13.25 inch platter with the printed mark you show (without Stoke on Trent) at the top, on p. 287 in my book: "The Illustrated Encyclopedia of British Willow Ware." My platter also has an impressed circle mark with an anchor in the center and printed around the circle: W & C Stoke-on-Trent. That mark tells me that my platter was also made after 1872. The engraving on my platter is exceptionally good for that late in the 19th century. Your plate looks good too.
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