James A. Stack, Sr. Collection - "landmark discovery"?

https://stacksbowers.com/james-a-stack-sr-collection/
I received an email blurb from Stack's today, advertising the upcoming auction of more of the James A. Stack, Sr. Collection, apparently for the first time in 30 years. It teases us with "One coin in particular – yet to be revealed – is a landmark discovery for all of numismatics."

Any guesses as to what that coin is?

 

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When is the auction? My best guess is a unicorn of some type.

 

The link says Dec 2025 and Feb 2026. Preview a few of the coins at their ANA table.

The bit about landmark discovery "yet to be revealed" implies something new that nobody has heard of, still sitting in that collection which last had an auction from it 30 years ago. One-off pattern or trial piece perhaps? Not sure if I would consider that a "landmark" but you never know considering how auctioneers like to puff things up. A second example of a coin where there was only one previously known, like the 1652 NE threepence that popped up over the past few years?

 

Someone say NE?

 

Did I comment on that thread @SensibleSal66 ? I noticed that it mimics the NE stamp on those original crude coins, but on a CT coin seemed odd considering the originals were made in Boston.

 

And did you also know that CT was settled by the Puritans from MA and England.
History of Connecticut - Wikipedia

 

I did a recce on StacksBowers upcoming auctions and saw 25 lots in a current auction (Stack Collection) but upcoming stopped at Sept. 2.

A lot of interesting coinage currently, a broad mix, 2 gold at 34K and 32K (both way out of my range, btw) but very interested in the item “to be revealed” later. Thanks for the update. Keep us posted for any juicy info…
@KBBPLL