Sperry Instruments UK

My Mum worked at the Brentford factory post war.

Welcome! Not sure I can help, but if you haven’t seen this it might be interesting –https://www.flightglobal.com/pdfarchive/view/1963/1963%20-%200456.html

For its size (small), Stonehouse produced a disproportionate amount of precision-engineered equipment for the war effort. Hoffman/SKF bearings, used in practically everything British flying, were also made there. Interestingly target photographs were taken, but no raids occurred.

Having spent my teenage years there, I should point out that Stonehouse is not an area of Stroud. Saying that would get you thrown out of the Woolpack! 😉

Hi,
My late Granmother worked in a Sperry factory during the war, in Stonehouse, Stroud.
I remember her telling me she made Spitfire artificial horizon instruments, I am looking to buy such a item, Is there anyway of telling which factory one was made in, Ive seen one with tags marked Brentford , London, Would the Stonehouse made instruments still have Brentford tags ? , I understand the factory moved from Brentford to Stonehouse to avoid being bombed.. Any info would be grateful .
Regards
Ben

Ben, welcome to the forum!

Just looked a a couple dated 44 and 47 and they do not have any make at all on them. The only clue is a paint inspection stamp which is the same in both cases (a vertical oval frame with an S overprinted with a small picture of a gyro and a number beneath)

In another case, the Henry Hughes navigation instrument factory in London was bombed and production switched to the Venner timeswitch factory in (? Harpenden?) and these instruments were marked with a (V) after the serial number.

Any markings would be cryptic to avoid alerting the enemy to the location of the shadow factory