Royal China Ironstone Acapulco Pattern

by Kat
(Louisville KY)

My grandmother's dishes, probably from the '60's but I can't find the pattern anywhere on the web to date it more accurately. Royal China, Acapulco pattern, except I can find it on the internet.

It uses the same blue as Royal China Blue Heaven pattern, and in fact a couple of the extra pieces are actually Blue Heaven. There is a spiral of blue marks in the center of the plate on a paler blue background. The spiral is similar to a nautilus pattern. There is a pattern around the rim similar to arches or scallops. Any help will be appreciated.