This is a very nice original Eisemann AM-4 four-cylinder base mount magneto for an old garden tractor or power unit engine.   It is in excellent original slightly used condition with no cracks, breaks, or repairs that I can see or know of other than some handling wear.  It is clockwise rotation.  It mounts with 3 optional sets of holes which are 2 inches apart on center and the mounting threads are in great shape.  It has no noticeable bearing wear and turns over very nicely with good magnetic pull.  It puts out a hot, snapping spark on all four leadouts that is sure to run your engine if it is set up properly.  It has the original name/serial tag as can be seen.  The drive lugs have almost no noticeable wear and I don't think this magneto was used very much.  This magneto should be ready to go to work on a tractor or it could be put on your shelf for a future project.  The pictures tell the story.  I can be reached at 262 573 193 1 if you'd like to talk about it.  Good Luck.