Pretty certain that's a wenge neck, and despite what newer Warwick owners might say... THEMS WENGE NECKS MADE WARWICKS, WARWICKS! IMO only, of course

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I've owned both wenge and ovankle necked Warwicks, and to me there's no comparison. I swear there's more growl in a wenge neck, and I love the feel of them. They seem super organic and woody to me, like they have a spirit to them. The other necks just feel like bass necks. I'm sure they're awesome too, but I'm partial. I've owned 5 different Warwicks. Only held onto one of them, a Fortress One, with of course - a wenge neck.
My first Warwick was the same one you just scored for $100, only active. I bought it in 1999, for $999, new. I loved everything about that bass except for the weight (bubinga weighs a ton), and the active pickups were too hot for my liking. I never played the passive version of the bass, but I think that might be just what that bass needs to make it sing perfectly, and sit in the mix like nobody's business!
You scored. Big time! Congrats!
And if you ever consider selling it, know that the prices on Warwicks can get a little crazy. A few years back a passive German Corvette would go for anywhere between $500-$700. If you got really lucky you might find one in the $400 range, but that was rare.