That's a good question! I guess if you had the MMCX like pictured it's the Rh+ but instead of Oyaide MMCX it's the Ref (OFC copper) version of the MMCX. And the way it's differentiated from the Ref is that the choker is not darker coloured maple but the Rh+ type light coloured wooden. I'll ask the Brise Audio guys how to tell the difference. BTW, the PTK2017S was very limited and not sold after the show today. There's another show next weekend by e-earphone (PotaFes), I don't know what Brise is going to show there.