I found these while cleaning. I believe the Koseidon is Chogokin (diecast metal). I am not a collector, so there are many scratches, scuffs, and paint chips. Some parts are missing. The Blue Noah is light, so it is not Chogokin. There are many missing parts, scratches, scuffs, and paint chips. Please refrain from bidding if you are a perfectionist or concerned about packaging. No returns or exchanges due to concerns about switching items.