The SPAD S7 was the first of a series of successful aircraft produced by Société Pour L'Aviation et ses Dérivés during WWI.  The S7 was renowned as a sturdy and rugged aircraft with good climbing and diving characteristics.  It was also a stable gun platform and was flown by a number of the famous aces such as Georges Guynemer.

SPAD began development of a single-seat biplane in early 1915.  The first models were equipped with the 150hp Hipano engine but later models were fitted with the 180 hp engine.

The S7 entered service in August 1916 with Escadrille No. 26. The RFC also purchased the aircraft and produced it under licence at Weybridge.  Later, in 1917, the S7 was also employed by the American air service of the AEF.

This prop is British made by TWK Clarke who were co-located with the SPAD factory at Weybridge.  The British drawing number of AB 755 but the prop was designed by Éclair of France.  The drawing number is stamped in the usual way but the rest of the data has been stamped in ink on the bare wood and has migrated after the varnish was applied.