It's a limited release, they only pressed 700 copies. It's intended to make the copies more valuable (similar to limited releases of prints for visual artists).
It's a bit ambiguous but it looks like there might be more copies of the record, but only 700 of the gray-and-black swirl limited edition.
This site specializes in limited releases, you can compare. Or, if you share the name of this album, it might be possible to look it up and see if it appears in that or other registries.