I got the R.L. Allan's Cambridge Crystal Edition when my KJV Ruby arrived. I enjoy this little bible. It was described as having a kid goatskin cover which would imply that it was very supple. I have found as with other Cambridge editions that it is not near as supple as my R.L. Allan NIV Bold Reference Edition or the Ruby for that matter.
For it's size it does have extremely clear (yet small) type and is very functional for travel. The print is fine and many who do not have exceptional vision might find it very hard to read without reading glasses. Despite that it is a very well made bible. This costs about 30 sterling pounds or (less than 50 US greenbacks) and is well worth the money if you are looking for a KJV that you can take with you. I do all my memorization of scripture in KJV despite the fact that I read the ESV and NIV quite frequently. This bible is great to take with me for a back up reference when I get stuck on a set of verses that I am memorizing.
It comes with a pretty good concordance. It reminds me of a shrunken Cambridge RD266 in goatskin leather without the maps of course. The smell is great and the paper of excellent quality. It is small though, which is the point since it is a more of a pocket or travel bible. A great edition to my collection. Smyth sewn and all that jazz. A very high end quality pocket bible. One that will last unlike those tiny ones you get from Zondervan or one of the other bookstore type.
R.L. Allan's website calls it the Allan CC1 Cambridge Crystal Edition. The R.L. Allan's site shows that they are not selling it anymore but they may be waiting for a reprint. The link to R.L. Allan's website is here.