A Newman Portal user this week searched on "Maris 66-v," using the NNP advanced search page and restricting content type to auctions. The Maris 66-v is a rare New Jersey copper variety, and Newman Portal locates only 48listings in its database of over 5,000 auction catalogs. The recent ANS publication on New Jersey coppers (2013, by Roger Siboni, Jack Howes, and A. Buell Ish) describes the popularity of the variety:

Siboni, Howes, and Ish report no uncirculated examples. An EF coin appeared in the Stack's Bowers Americana sale of January 2013 (lot 11401) and realized $8,225.

Image: Maris 66-v New Jersey copper, from Stack's Bowers Americana sale, 1/2013, lot 11041, realized $8,225.

Link to NNP advanced search:
https://nnp.wustl.edu/Library/AdvancedSearchForm