The 1st gen. Atom 440 (pedal #1 above) was used on high end drop-bar lightweights from 1960 through 1971. This included the Continental, Super Continental, Sierra, Super Sport, Superior, S/S Tourer and Sports Tourer, but not the Paramount. One exception I found was that the Continental was apparently downgraded to Union pedals (same as used on the Varsity) for 1963 only. No reflectors were used on these pedals during those years. These pedals have a unique alloy screw-in dustcap.
I recommend including pics of the dust cap ends as well as any stampings on the axle, cage, spindle end, etc. Pedals around 1974 and later will normally have date codes as well. If they came with reflectors I would also include the numbers cast into the reflectors. For example, the 2nd gen. Atom 440 normally came with reflectors, and the reflectors changed at different points over the years as the regulations changed.
PS: The forum currently does not allow posts to be edited after 24 hours, making these sort of reference topics difficult to accurately maintain without it becoming a mess of more and more posts adding to or contradicting earlier ones.