NGC 891 (Uppsala 1831, MCG 7-5-46) is one of the finest edge-on galaxies in the sky, particularly as viewed in larger instruments. Shining at nearly 11th magnitude, NGC 891 subtends a long, skinny 13' x 3'. It lies at a distance of about 20 million light years, nearly 10 times as far as M31.
I was recently reintroduced to this galaxy in an 18" Dob at the Enchanted Skies Star Party. It really shines in a telescope of this size or larger. Look for an irregular dark lane running the length of the galaxy, nearly cutting the disk in two. Also look for a slight fattening surrounding the center. This is the nuclear bulge.
If you are feeling adventurous, you may also want to have a try for the nearby galaxy NGC 910, which lies about 45' to the southeast. This is a small, 2' x 2', 13th magnitude elliptical galaxy that lies some 210 light years distant -- over ten times farther away than NGC 891.
Those with larger instruments looking for a challenge should look carefully within a 1o radius of NGC 910, for it appears as the center of a tight cluster of at least a dozen tiny 13th - 15th magnitude galaxies!
The view in a 6" at 50X. North is down and east is to the right.
This image is taken from the DSS using SkyView.