On 29 August 1935, quickly after the completion of proving flights, an initial order for 17 aircraft (serial numbers K7287 to K7303) was placed by the Air Ministry to fulfil Specification 17/35; six more aircraft (K9676 to K9681) were ordered in May 1936. The first production standard aircraft made its first flight in December 1936, and entered service operation with the RAF on 16 April 1937. The final Stranraer was delivered on 3 April 1939. In addition, a total of 40 Stranraers were manufactured under licence in Canada by Canadian Vickers Limited, as both Supermarine and Canadian Vickers were subsidiaries of Vickers-Armstrongs.
