Thank you for submitting your item for appraisal. This appears to be the stamp commonly identified as Scott #231 Broken Hat. The name "broken hat" refers to a nick in the hat brim of the third figure standing to the left of Columbus. Various degrees of progressive damage are known. The low estimate is the price this stamp usually sells for if in good condition. The high estimate is the current catalogue value. This would be only a reference value. Only a very desperate collector in need of this particular stamp would be willing to pay the full catalogue value.