Cathy, yes, Iris (GF) was surprised by the working of the stitch length regulator. I was too. I need to look at that a bit closer.
The RAF is dated 1934 so it is prior to WW II. I was quite pleased to bring it back to life.
I drove a Triumph Spitfire for quite a while and considered painting it with RAF insignia. Perhaps I may do that with a Raleigh 3 speed full fendered bicycle.