Leading off the three-day series of sales on Sept. 30 are the Gary B. Nash collection of British Commonwealth and the collection of U.S. postal history formed by James E. Challenger.

More than 450 lots of choice United States and Civil War postal history will be featured in Robert A. Siegel Auction Galleries’ Sept. 28-29 auction in New York City.

The auction includes more than 2,200 lots and features name collections and material from more than 40 other consignors.

Included in the Greca collection is an attractive assemblage of 33 covers franked with Cape of Good Hope Triangle stamps.

The first day of the auction, Sept. 15, focuses on worldwide single lots and collections.

Leading off the sale are 360 lots of U.S. and possessions stamps and covers.

Two different examples of a classic error from Western Australia are offered in the Abascus Auctions Aug. 5-6 public sale near Melbourne.

Among the highlights of the British offerings is the specialized collection of Great Britain King George V Seahorse issues formed by Steve Pacetti.

Among the 104 lots of essays, proofs and specimen stamps in the July 20-21 auction is a handsome complete set of 1881 Atlanta trial color proofs.

As well as setting a new world record, it marks the first time any philatelic item has fetched more than $10 million.

The sale offers worldwide stamps, postal history and collections, including individual lots from the Redcentre and Kimberley collections of Great Britain.

Previous Stamp Out Cancer auctions have raised almost $300,000 for cancer research.

The 685-lot sale opens with an impressive selection of early stampless covers sent from Jamaica to various destinations.

The auction offers strength in United States, Austria, Egypt, Estonia, France, Germany and colonies, Italy and Italian areas, and Poland.

Leading off the series on June 26 is a sale of stamps and postal history from the People’s Republic of China and liberated areas.

The upcoming Rarities of the World auction from Siegel Auction Galleries contains mostly United States and related material.

The other two surviving Mauritius Ball covers reside in the Royal Philatelic Collection owned by Queen Elizabeth II and the Thomas Keay Tapling collection held at the British Library.

Among the rarities in the June 12 session is a used pair of Canada’s iconic 1851 12-penny Black Queen Victoria on laid paper.

The auction series begins Monday with part 4 of the J. Chalhoub collection of Egypt.

Part 5 of the massive Erivan collection of U.S. and Confederate States postal history will cross the H.R. Harmer auction block June 24.