It looks like a "base" level unit, with the dopler-effect woofer and a stationary Tweeter. The upgraded units will have rotating horn tweeters.
If it has internal tube amplification the amp is very worthwhile for mono setups, or stereo if you find a match. The typical power tubes run from 6L6 (usually 6L6C) through 6550s or KT88s.
If the unit has a solid state amp, or worse yet no internal amp at all, the utility is likely limited to pro audio applications. Both guitarists and keyboard players still use Leslies on a regular basis.
Another issue is that many earlier Leslies contained Amphenol connections that were specific to the brand of organ they were sold with. So you might need to mod both power and signal feeds to get the unit to work.