A few months back, disguised as a shopping trip with the wife, I went on a pilgrimage to a small arcade in Tottenham court road, London, where I heard there was still an old 1942 cab in use. I got there to find the place closed & gutted due to a refurb, which no doubt includes sale or disposal of 1942.
The oldest machine I know is an outrun 2 in Swanage, dorset. Used to be a 4 player set. Now down to two, one with a rather burnt looking CRT. That's about all I've seen.