The prices smell like a typo.

The lens, well, it smells like a 400/6.3 Telemar-17. There are several on offer on eBay at much lower prices. See the 1963 GOI catalog, which can be downloaded from: If you look in the catalog, you'll find two other 400/6.3s. I'm pretty sure it isn't an Arktik-A or an Ob-87. None of these lenses has anything like the claimed coverage.

The seller reeks of ignorance.