Coat of arms lion type m75 0,20 mk olive type a II Ay booklet stamp

The coat of arms Finland 0,20 mk olive green definitive stamps model m75.

Different types of this stamp (by Michel catalog):
818 type a I, A perfor. 11 3/4, phosphorescent y paper 1977
818 type a II, A perfor.11 3/4, phosphorescent y paper 1980
818 type b II, A perfor. 11 3/4, normal x paper 1989
818 type b II, A perfor.11 3/4, phosphorescent y paper 1985
818 type b II, C perfor.13x12 1/2, normal x paper 1998
818 type b II, D perfor. 11 3/4 (on 3 sides), normal x paper 1987

a = The value number's decimal comma wholly coloured.
b = The value number's decimal comma is not filled by colour (outline).
I = Value numbers and frame around Coat of Arms wholly coloured, sometimes by crossed lines (grid).
II = Value numbers and frame around Coat of Arms 'striped' (parallel line raster).
This stamp exists in various shades of the olive green.