I have a pair of both. My levers which are defo athena have a plastic body. I bought a pair of levers last year which were sold to me as c-record, they have a metal body. Although I now believe that these levers are chorus based on other posts on this forum.
I dont think that you can go by the clamps as most of the levers at this time had the shield logo. But from memory my Athena clamps had a light grey dull clamp whereas the C-record/Chorus had a shiny clamp.
The levers will look identical but as athena was cheaper than chorus I would expect that these are Athena. Although as always on this forum I may be corrected by someone else!
Stephen