A unique and probably one-of-a-kind lens showed up on eBay in early 2018. The 83mm f3.5 Ansco Anastigmat lens (which is actually a Wollensak) was mounted in a brass barrel fitted with an Exakta mount.
The first auction posting showed just the lens. A subsequent post showed the lens mounted on an Exakta Varex.
No details, other than the photos, were available about the lens. The seller didn’t know anything of its provenance, so who or what prompted someone to make such a thing are unknown.