I glad to see one of favourite M600 pens back in rotation - such a pretty ruby red colouring.
A monster nib - custom made by John Mottishaw almost seven years ago - back in the good old days when the Australian dollar was strong. This is a beautiful wet stub that is so so smooth.
My 40th Robert Oster Signature ink - a purchase from a Brisbane pen group member. It is called Copper but I think of it more of a burgundy. It exhibits some good shading from this super broad nib and is a colour that quite appeals to me.