It's a Samsung ju6800. Its not HDR certified but it does do a pretty good job of hdr.
That's a 2015 model so the specs would have been set in 2014, before any universal HDR formats were fully certified so you're lucky to get any form of HDR out of it. It might just be a pseudo-HDR effect that it creates, unless there was some form of firmware update that enabled something. There are no HDR specs listed for it all on the Samsung website. If you like the image quality then stick with it, you're not missing much in terms of HDR on SkyQ. It's distinctly average so far.