I have too many of these rare strobes (I can't carry them all on one dive!), so now I'm selling one of them. It's in great shape and has never flooded. I still have not found anything as powerful as this on the market today.
In the pictures the slave sensor looks a bit funky because it is wrapped in black electric tape (to make it not show up as much in pictures), but under the tape is the original logo.
$500 for the whole package, plus shipping.
I have rebuilt battery packs for these strobes with great success, and I will tell you where to get new ones, should you ever need to.