We typically tell people that MAD's start to be worth a numismatic premium when the letters start to fall off the edge. This one is pretty close to that and since the cost of ownership is low, I'd probably save this one. If nothing else, you've got a really nice example of what to look for @ted.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz