The Vermilion does *not* have silver-plated copper wire.
"This is the only Urushi cartridge that uses a double-coil winding of silver-and-copper – not silver-plated copper – and the coils here are made with fewer turns. Thus it has the lowest output of any Koetsu at 0.2mV, and half that of any other Urushi."
https://www.hifinews.com/content/koetsu-urushi-vermillion-cartridge
I have heard great things about it and it's the one I would buy, shopping at that level for a Koetsu. Hopefully next year.
"This is the only Urushi cartridge that uses a double-coil winding of silver-and-copper – not silver-plated copper – and the coils here are made with fewer turns. Thus it has the lowest output of any Koetsu at 0.2mV, and half that of any other Urushi."
https://www.hifinews.com/content/koetsu-urushi-vermillion-cartridge
I have heard great things about it and it's the one I would buy, shopping at that level for a Koetsu. Hopefully next year.