The M620 Madrid is basically the same patterned material as the Berlin but in red rather than green.
Another older (note the two chicks on the logo) M600 nib this time in 14K gold - not as fine as my 18K versions but still finer than the newer 14K mediums I own.
Not much to say about the Robert Oster bottles - a good shape for inking up of plunger filled pens.
Orange inks almost always shade, all Robert Oster inks shade.
A good orange colour, nice shading from this average medium nib, would be very good in a broad stub.