Three Generations, Moscow, 1969
Thanks to @stopani6 for confirming that this is Moscow.
Thanks to @mixtara for confirming that the photo with these woman in the background is in Dubna, north of Moscow.
I had this labeled London before and had this comment: "This could be Moscow, but the slide numbering makes me think it's London. Perhaps a viewer recognizes the clothing styles in capitalist and communist countries in the 60s?"
Taken by my grandfather David C. Cook on the way to a visit to Moscow for a meeting of the International Electrotechnical Commission. Scanned from an unlabeled Kodachrome slide in a slide cartridge marked "Russia".