Mexico 1868 6c-100c Hidalgo Thick Figures Issue, plate proofs. Set in issue colors (Heath & Stout refer to them as essays), with additional 100c without period, 6c with o.g., others no gum, all with full margins, Very Fine, a very scarce set of proofs. Scott No. 58P-64P  Estimate $300 - 400. $0 (Image)