the prototype, which differed from the standard wibault 7 by having a new undercarriage and british instruments, was delivered to britain in february 1926 and was later fitted by vickers with strengthened wing struts. the durability of the aircraft's all-metal structure, together with promised good altitude performance, attracted the attention of the chilean military air service, which, after evaluating the prototype, placed an order for 26 aircraft, known as the vickers type 121, or vickers-wibault scout.