I bought 3 of these from this seller 'Magicdiscounts' recently and that was the last 3 they had, but now it looks as if they have more in stock. I ordered only one to start with, just to make sure they were genuine and they were OK. Free postage and they arrived within 3 or 4 days. I'm going to try my hand at making a couple of customs out of the other two.
They are Maxell logo'd if anybody remembers the old Maxell Ferrichrome tapes from years ago. Showing my age there, happy days recording the John peel show at 22:00 every weekday during the Punk era.
Anyway, just do a search on Amazon UK for 'Watchmaker 85' and you'll see them. Very cute and sooooooo slim and tactile...