Is This A Denmark 16 B?

Good day to all. Could someone please help me to verify if this is a Denmark two , used 16b, grey and blue color or another Scott number? I believe it is a grey blue color, however I do not know all the variations may be with this stamp. it was removed from a turn of century book. Thank you in advance.

These are other stamps that I found in mix lot of world stamps, Have many from Scandinavian countries and other areas. I have seen the 4 in blue, but also found this color variation. Are these stamps considered common stamps?

The 2sk is faded enough that I'd think it a grey and ultra, since the ultra fades faster than the blues.

The 4sk looks normal, I can't tell what the other 4 is, either skilling or øre.

The two 8 øre are both inverted frames, the overprinted is normal.

Thank you so much Bill for your assessment on the stamps. great to know the information pertaining to the color. The second 4 is a sk from the back can see the "S" when up to light. I agree it was difficult since the cancellation over it. I am still learning about the markings to tell difference between normal and inverted frame. I wasn't sure for the first 8 sk being an invert, but I thought the second one definitely due to the branch started at the foot at the second leaflet. That was easier to figure out than the first one. Appreciate your assessment. I learn more about these stamps every day!