That range looks like it had once been the Super Deluxe model... I see evidence of a deep-well cooker and possibly a griddle judging by the receptacle on the stove top. Or did that feed a deep-fryer attachment??
$450 is a wee bit optimistic and as Phil pointed out, if they are really keen to find a new home, why not say 'open to offers'?
Deep fryer attachment. This has a standard width oven of 17 or 18 inches, like in the 40 inch ranges and next to it, a small broiling compartment of reduced height to accommodate the deep well and all behind a single door so the broiler could not be used when the oven was being used for baking. The next year, there was a separate door for the broiler, then they went to the wide oven in most 30" ranges.
The parts that changed color/rusted are those that are painted (and not repainted!). The top of the sink must be porcelain and it matches with the range.