We find this bird really a very specially colored Long-Tailed Duck by Oiva Toikka. It is green, beige and blue!
You can read about Long-Tailed Duck (Alli) on page 18 in the book "Birds by Toikka" and on page 71 in "In OIva's Wonderland".
Long-tailed Duck was in production for many years, from 1981-2009, and over the years some change in both coloration and shape took place, with later variants having a metallic lustre and slimmer bodies.
Colors like in this bird are rare to find.
Indoors this bird clearly is darker than in bright sunshine.
Elsewhere on this site you can find different representatives of the Long-Tailed Duck to compare with.
Size: 185mm x 130mm
Signature: O.Toikka Nuutajärvi (in handwriting)