Just ran across this.
"Piszkiewicz's extensive collection of Chicago mail, which spans from the 1830s to 1950s, will be displayed and auctioned off 1-3 p.m. Feb. 9 at Collectors Club of Chicago, 1029 N. Dearborn St. Pieces are valued from $3,500 to $45,000."
https://blockclubchicago.org/2022/1...ctioned-off/I have his wonderful book "Chicago Postal markings and Postal History" so I can only imagine the quality at this auction.