A while ago someone was asking for a defective Voyager calculator in the ads section. The reason was that he wanted to commission Gfeller Casemakers to produce a custom made leather case for his Voyager calculator, and obviously, he didn't wanted to give away his own. As I had a defective 12C I sent it to him, and he offered to return the favor by sending me such a leather case. Well, that made me quite happy! :-)
Last week, I found a letter from the US in my mailbox. I was amazed when I found two leather cases inside! The cases are professionally hand-crafted, look very nice and will last forever I guess. One of the cases uses a thicker leather, the other a thinner one. In my opinion the thinner case looks more elegant whereas the thicker case provides better protection. Therefore I would choose the thinner case for calculators residing at one location (at home, in the office), and choose the thicker case when I take a calculator around with me in my backpack.
If anybody is interested in such leather cases you may contact: Steve Derricott (sd@gfeller.us) at Gfeller Casemakers. I'm not affiliated with this company in any way. I can imagine that such cases are not cheap, but as the company says on their website, leather goods are a solid choice and a wise investment, and in my opinion, they suit HP calculators very well.