Hello Brad,
We had an earlier discussion on a similar topic at
https://goscf.com/t/27755 Check it out, as I have an example very similar to yours.
It should be noted that there are several occasions where the silk thread is not visible at all which, I guess, means that you
may have to assume the least expensive variety unless you can prove otherwise. You can also see that there was some discussion concerning the impression (whether fine or rough) and the cancellation style.
As far as I can tell, your 5 rappen is of a Fine Impression which would probably make it a Scott 25 (dark brown) with, supposedly, a black thread.
Although not the best example (with the various faults noted by khj), I certainly do enjoy the "Sitting Helvetias".