Saw film in late 70’s on TVs so likely made in sixties. Was in colour. Key scene I remember was an object (blueprints/phot) was passed along a street scene with each give being killed in a comic way by the receiver. All receivers odd characters – a frogman coming up a manhole, an icecream vendor, an organ grinder with monkey. Each receiver also used an item relevant to their role to photograph the object. E.g. A tub of ice cream
I think it is The Last of the Secret Agents