Looks like an ok mag. Here is how I test F-4 Mags (I learned it on this site)
Take the cap off the mag and note the position of the "Contact" - draw a picture to aid your memory. Put the cap back on. Then take the mag off the tractor. DO NOT rotate the engine or you will get it out of time.
Get an extension for a 3/8 inch socket set and cut it in half. Put the male half in an electric drill. Find a 3/8 drive socket that fits the nut on the drive end of the mag - best I remember it is 13/16.
Put a spark plug wire in one of the holes in the cap and spin the mag with the electric drill and socket.
Hold the other end of the spark plug wire next to the mag base and observe the spark. A rebuilt mag should give you a spark that will jump 3/8 of an inch.
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