http://www.ebay.com/itm/Jerico-4-spe...9ZZ6bL&vxp=mtr
That's the WC4 which is the road race tranny. Jerico offered 3 versions of this tranny the main differences were standard polished gears and aluminum case. It appears you've got the alum. case, but that was standard on the 2 later variants. I've got the same tranny. It is a beast, hard to break, hard to mesh gears at low speeds (cruising), but virtually unbreakable and the harder you drive, the more you'll like it!
Good price by the way. These things sell new for $4500.