After I made a reference to these two Danish stamps
in the Engraver's thread I noticed that whereas
Scott lists them printed Photogravure and Engraved
Michel 635 - 636 shows StTdr. und Odr.
(Engraved & offset)
Scott 597 - 598
On both stamps the orange yellow on the lilies and the
dark green area around the lilies is engraved.
The rest appears like photogravure but then again looking
at the edges and the name of the designer I see no
dots. Notice also the smeared areas on DENMARK.
So could it be litho/offset?
The yellowish diagonal grid around the edges is tagging,
glows very bright yellow on 598 but less so for 597.
Danish commemoratives for this time period have fluorescent yellow
glow all over not just around the edges which makes me doubt
they were printed by the Danish Printing Works at all.
I believe I read somewhere that all stamps for this Nordic Country Co-op joint
issue where printed in Finland for the five participating countries.
Notice also that there is no engravers name which is unusual
for danish stamps.
But then again there isn't much engraved on the stamps so maybe
nobody wanted any credit.