Pretty sure it's not CC. As far as I'm aware, the block and arches only came in the water set (Glen, if you know better, do say). #836 is a similar pattern, but it's not that either, as the blocks on your piece are raised out from the pattern, the finial is wrong and the blue is not a CC blue.
Is that base mirror polished? I'm sure I've seen a pattern like that - Walther 'Mary'? Was it one in Glens' Czech Special (which I can't find)?? Over to Glen and Pamela.