I've been told that there are three of these.  All three were brought to the big fruit jar show (no, that is not a contradicton in terms) in Muncie by a nearby farmer.  This jar is an intersection of several types of collecting which are very hot, so is a desirable property.  One of the "hot" types of collecting is mason mars.  There are lots of people who are gaga for mason jars.  Another is midgets, and ditto on their gaga-ness.  Finally, cobalt jars which are definitely hot.

This jar is listed as "light cobalt" in the Red Book and it's about as close to a real cobalt midget as you're likely to find (but there are many repro midgets..).  The only other one that I think might vie for some sort of "cobalt midget" is the swirled one I own here.

This is the reverse of the jar and you can see the "CFJCo" logo here.  The stuff that looks a bit black is just reflections.