im getting old I think !!!!! got to be 1975 then

Soory Chaps, I think it was 1973 for some reason I have lots more to share if interested. Dad used to do his own black and white developing i was sifting through about 500 negs last night also lots of slides including the reds in gnats.

Serial Range L1547 – L2146 600 Aircraft
Built by Hawker Aircraft Ltd., of Kingston and Brooklands, to specification 15/36 under contract No. 527112/36. The first 430 aircraft were manufactured with fabric covered wings; the remaining 170 with metal covered wings, some aircraft later re-fitted with metal wings at Maintenance Units within the R.A.F. Aircraft deliveries commenced on the 15th December, 1937, and were completed on 6th October, 1939. L1547 was first flown on 12th October, 1937.

, Hi J.F, Not Kestral.
Ok clue time
yes its from the most famous piston engine, but more to that is what part this item is !

closer still, but a couple of years forward