Prices of Alembics vary greatly between the U.S., U.K., and Japan. Some of that seems due to the greater expense involved in getting a new instrument to another country in the first place but more than anything I think it’s a supply and demand issue. When there are fewer options the prices will be higher. From what I’ve seen internationally though, I’d agree with others that, given its condition, this one is overpriced as are many that I see on Reverb.
If your looking for a Series bass one thing to seriously consider is the body type. I have an short scale Series I with an SC body that’s become my main instrument. It’s comfortable to play for hours and easy to get around when playing a variety of different styles. I also have a medium scale Standard Point but that’s a totally different animal for someone who isn’t 6’2” and 180 lbs. When I play it, it’s typically sitting down as it just doesn’t hang well for me, is heavier, and the sheer body size itself makes it more difficult to play for me. But that’s me. Body size might not be an issue for you.