I'm Confused By This 1890 Stamp

I'm confused by this 1890 stamp. It certainly appears to be a coil stamp, but coil stamps weren't produced until 1908. Does anyone have an idea what this is?

I'll go with a scissor trimmed Scott 220.

The top is a natural straight edge at the top of a bottom pane of 100. The bottom looks scissor cut.

Measuring -- very very precisely -- from the top edge on the left of the stamp to the bottom of the bottom edge, then doing the same on the right side of the stamp, should yield the same dimensions if this is some kind of coil or some partially unperfed stamp as issued. If the measurements are "off" a little, the bottom has been cut by someone with a guillotine paper cutter or scissors.

If so, doing that could have had nefarious purposes but more likely it was done to tidy up a messy bottom of the stamp or some other innocent reason that person should have avoided. Unless . . . the first row of perfs at the bottom of the top row of stamps was somehow not there and . . . Nah! That's really unlikely.