Here is a cup which has been part of my collection until recently but I have now parted with it as a gift to a friend. I tried to research the origins of the 6364 marking- it is very similar to the Art Deco design Collingwood Blue Florinda 6494 but not quite. For once Google let me down.
Time to go and sort out some of my paper collection and make a couple of cards....seem to spend alot of time sorting and not enough crafting.