You are bidding on a used Holley list number 80457-12 600 cfm vacuum secondary four barrel carburetor with an electric choke.   The carb is complete, and the throttle plates, adjustment screws, and other linkages move freely.   It's got a little dried mud on the outside (it was on a 4WD truck that did a little off roading), but as can be seen from the pictures,  it's absolutely spotless inside where it really counts.   The polished exterior will clean up nicely.   As with any used Holley carburetor, all of the gaskets should be replaced before use.  These are currently going for at least $430 new.  Happy bidding!