the top on is n-record, the bottom one is record/s-record. there is some debate about super-record track hubs; they show up in the catalog as having ti axles, but it's generally thought they were never produced (there are folsk who have said they've seen them though).

there is no difference between the steel-axle record and super-record pista hubs afaik.

c-record (sherriff star) hubs look different; much more highly polished for one thing...