It arrived yesterday and I really like it. It is small, completely unused and in its original box, with key. My favourite ones are the ones with thin paper and pink and blue lines, and this one has them in spades!
It comes from the 1960s and, interestingly, the gilt embossing from the front cover is reproduced in blind embossing on the back cover, which I thought was a nice touch.
I have a set search on eBay for these and hardly any have come up for sale this past year.