The second part of the Byerley Nicaragua collection consists of 307 lots of stamps, postal history, specimens, plate proofs and more.

A number of name collections will be sold during the three-day auction.

The CIA Invert block is one of the 1,215 lots of U.S. and worldwide stamps, proofs, postal history, large lots, collections and additional material offered in the upcoming sale.

The two-day U.S. sale features almost 900 lots and opens with an attractive selection of essays and proofs, specimens and postmasters’ provisionals.

The auction includes more than 2,100 single lots and 4,400 collections.

First to cross the Spink auction block will be 400 lots of Great Britain stamps and postal history.

Numerous appealing and eye-catching items of postal history to satisfy a broad range of collector budgets will be up for bids in both sales.

Highlights of the sale in New York City include free franks, autographed letters, imperforate classics and Civil War patriotic covers.

Bidders will find items to suit a broad range of budgets and collecting interests.

The quality throughout the auction is very high, with 27 stamps grading 100 to indicate mathematically perfect centering.

The Mauritius sale offers stampless covers and additional items through the 1858-62 Britannia issue.

Many of the 144 lots feature covers documenting disruptions and other unusual factors that affected mail transport during the war years.

Collectors will bid on the only known used block of four of Denmark’s 1851 2-rigsbankskilling blue.

The earliest material in this sale stretches back more than three centuries, beginning with folded letters from New France.

The Berg collection will be followed by more than 3,100 lots of German and worldwide stamps, postal history and philatelic literature.

According to Dutch Country, the February 1852 folded letter is from an estate find.

The auction opens with more than 140 lots from the Granzow collection of the 3¢ 1851-57 issue.

In its description of the sale, Cherrystone draws attention to “an exceptional collection” of World War II occupation proofs and essays from Poland.

The sale features numerous scarce and unusual items among the classic postage issues.

Two of the catalogs prepared for the sale feature specialized material from China and Asia, respectively.