Hi, I'm moving this query from another forum in the hope of finding answers more quickly. I have, what I'm told is, a Conway Stewart 524 Dinkie in 'Rainbow' colours from the 1920's made in casein. However, I can't find any mention of this in any on-line resource - and there are some good ones out there! I post a picture of the pen/pencil set in the hope of getting a proper identification. The engraved markings are a bit too worn to see clearly. Is this genuine or have I been mislead? Many thanks in advance.