A couple of things: First, there doesn't appear to be a DS-5 power supply, so add the cost of a new one to the final cost of this guitar. Also, the pickup selector knob on the lower horn doesn't appear original. It also looks like it may have been modified in some manner. I would certainly inquire about that.
Without the power supply, or any mention of it, I'd suspect the seller hasn't played this a lot and may not know a lot about Alembics. It is probable that the 1/4 jack is wired stereo, so, without the power supply, the seller likely only could test the neck pickup, so I'd wonder about the claim that:
GUITAR IS IN EXCELLENT CONDITION AND PLAYS AND SOUNDS LIKE A DREAM !!!!
Assuming the electronics are in good order, (and even then it might need a $1500 upgrade if it picks up rf interference - though my '76 Series I guitar, very similar to this one, hasn't had the upgrade and I've had no problems), the current price and then a little more is certainly fair, especially with the road case.
Bill, tgo