Maria, those Mi-Pets are nice pans, not too rare nor too valuable. All cleaned up you've got a $10-25 piece I'd say. "Sits flat" or "sits nice a level" are words that drive me crazy as they don't tell a thing. Of course most pans with heat rims will sit level even if they are mildly warped. What we want to know is if the pan has any warps, twists, or a crown or bow to the bottom or cooking surface. "Sits flat" is so generic and I wish those words would go away. Now you can look for more Mik-Pet pieces of which there are not a huge number. Skillets in sizes 5 and 8 and maybe a larger one; a skillet griddle, a No.4 oval roaster, dutch oven and probalby a short handful more. All very nicely cast pieces.
Steve