Wiesenthalhütte colour comparison

I thought I'd share a few types of blue that Wiesenthalhütte used in their earlier period.
There's a lot of Polarblau (PBL) items floating around, Montan (MO) is also a pretty common colour.
But colours like Island (I or IGR) or Mittelblau (MTT) don't pop up very often.
Set up a few items next to each other for comparison.

From left to right:

- Vase 1063 designed by H.H. Engler in 1960
Colour Island (I)
Height 16,5cm

- Vase 1106 designed by K. Breit in 1963
Colour Polarblau (PBL)
Height 29cm

- Vase 1007 designed by K. Breit in 1957
Colour Mittelblau (MTT)
Height 30cm

- Vase 1009 designed by K. Breit in 1957
Colour Montan (MO)
Height 40cm