A Rare 1966 Exhibit Baseball Uncut Sheet?

I ran across a rare item in Ron Oser Enterprises’ April 2001 catalog described as a 1966 Exhibit card uncut sheet from the last year that exhibit cards were issued. But I don’t know that the description was accurate!

My understanding is that the 1964-66 Exhibit cards don’t have ‘Printed in USA’ on the fronts and have blank backs, and it looks like the Berra batting card has that text on the bottom right. I’ve also read that this late series has 32 cards that were reprinted from the 1963 Stat set with blank backs (the ’63 set has 64 cards in the checklist), but Adam Warshaw has the best book on exhibit cards, Exhibit and Related Sports Arcade Cards, and he wrote, “As ESCO declined it issued a series of cards in 1964-66 that are substantially short printed and sell for a lot more than similar cards.” He went on to say that “the postwar run also yielded a key error card. Barney McCoskey is the corrected-common; Barney McCaskey is the error.” And I don’t see that card on the sheet. I also have seen 1963 Stat back checklists, and they don’t include a Mantle Portrait, which is included on the sheet and which Warshaw mentions as a key item in the late series. I’m so confused!

It looks to me like the exact same 1947-66 Exhibits uncut sheet that REA sold for $450 in the summer of 2019. They described it as a “32-card uncut production sheet.” They also wrote, “It is a virtual certainty that this sheet originates from the dispersal of The Exhibit Supply Company archives. Long ago, when the company was no longer in business, many of the photos, uncut sheets, and various advertising materials from the archives of the Exhibit Supply Company were scattered to the four corners of the collecting world.”

So, is this a late series sheet? Does the late series have 32 or 64 cards, and what’s their design makeup? Let me know if you know!