Roget's "The Economic Chessboard" by Longman et. al.

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Roget patented his "Economic Chessboard" travel set in 1845. The earliest ones were manufactured by De La Rue, but then Longman (et. al.) took over the manufacturing. De La Rue later put out a similar board. The early travel sets by De La Rue and Longman are scarce, whereas the later similar boards by De La Rue are fairly common.