976/977 irons previously had the acorn hinge. When viewing an acorn hinge set in an 884 base, there appears to be quite a bit of extra headroom in the socket. Perhaps when the switch was made to the first ball hinge, it was sized to fit the existing 884 socket. Hard to say, though as there are at least 4 different 884 bases, one for finger hinge and three for acorn (and ball?) hinge.
As waffle irons go, regular pattern 8s are the most common, and are consistently valued lower than other sizes and paddle designs. If you really like/want it, and it has no damage, go for it. Me, I would offer $70 or $75 and see what they say.