This English Staffordshire ironstone oval serving platter is in the Blue Fjord dinnerware pattern by Wood & Sons - their version of Blue Onion. I can't find the exact production dates for the pattern, but based on the mark, it would have been made between 1954 and 1981.

The blue and creamy white transferware platter with swirl-scalloped rim measures 12-1/2 by 9-5/8 inches. It's in excellent condition with no damage, though when tilted toward strong light, you can see a couple of short, very shallow white utensil marks to the glaze. See my other listings for plates and bowls in this pattern.