I have, and have had, a few pieces that I think are unique to me on AK. This is not due to the items being really obscure or high end, but rather because I'm from Hungary.
I assume I'm the only one here with a Vibavoice Mini DAC. Vibavoice products were made by a guy for a few years, unfortunately he has since stopped producing them for health reasons. The lineup included DACs, amps, speakers, and also power conditioners, from a very low price to quite expensive pieces. Not a lot of info out there about them, but the owners are generally quite satisfied, myself included.
I've had a few vintage pieces from hungarian manufacturers Videoton and Orion. These were very "popular", (They were almost the only brands you could buy here. :sigh
and If there is another active Hungarian AK member I's sure he's had some of the same.
Finally there are my Hornyphon speakers, which other members have as well, only by the less stupid name of Philips 544 MFB.