@Blaamand. on this forum I could imagine they're not seen often - and 1 of the stamps you couldn't be more accurate... the middle one with the break in the right frame. is EXTREMELY rare - so rare that I have never seen one for sale ever! we'll get to value later, i'll drag it out to build up excitement :)
i too plate these coat of arms, mainly the 20øre value so I know a thing or two on these issues as well.
bicolored frameflaws are called "clichéflaws" or "Frame matrice" the coat of arms opperate in " Matrice types" and "galvano flaws"... all stamps should have a matriceflaw (should because not all prints are known in 100 stamp sheets so not all are known yet.) most stamps would also have a galvano flaw.. a galvano in coat of arms is ALWAYS tied to the same Matriceflaw through the prints.
so... to the first stamp

shown is the first screen of 3, 19 matriceflaws are known in 20øre... matrice 1, 2 and 3 are listed in facit and most other catalogues as varieties (there're NOT varieties)
matrice 1 which your stamp has are found in 330 positions in all prints of 20øre, if you do some math on how many positions and how many sheets where made you'd see that these "varieties" are extremely common.
your stamp is perf 12 3/4 making it difficult to plate, unless you can find a galvano flaw in it.
so that stamp is fun to have, extremely common.
the same is true for the 3rd stamp. found in 276 positions.
anyone excited yet?
2nd stamp is where it gets really really fun and profitable.
the stamp has a galvano flaw 2.101 (2 stands for 2. series, and the 101 is just the number of the flaw) and it has a matrice type 6.

this flaw is found in 13 positions so compared to the other 2 stamps already much rarer.

the flaw is also in those catalogues listed as facit 55v2 at a catalogue value of 1300 SEK.. but wait...... this stamp is perf. 12 3/4?????
only print 17 is perf 12 3/4 with this flaw, meaning this is position A5 (A stamp for A sheet and B stand for B sheet, these stamps were printed in double sheets.)
now back to facit we find that this stamp is facit 60v2 and listed at SEK 14000 !!
this stamp is extremely rare... and should easily sell at a danish auction for somewhere between $400-600 maybe even more!
so a big congrats on this stamp Richard.