Don't have a copy at hand, but isn't a spiked chain in the D&D Player's Handbook? Just raise damage by one dice size (i.e. d6 becomes d8 ) and take other stats from other full metal weapons.
Even if I appreciate the Howardian approach in the core rulebook, one thing I miss are various weapons not mentioned by REH (it doesn't have to be something weird like Orc Double Axe from D&D). Maybe in future supplements...?