1841 Penny Red (RH) Plate 20 on Cover DUBLIN Maltese Cross fantastic paper fold

1d. red-brown plate 20 RH with good to very large margins showing small part of adjoining impression at right used on 1843 (May 13th) entire letter to Banbridge by a superb strike of the distinctive Dublin Maltese Cross the lower left corner of the adhesive was folded back prior to cancelling so part of the Cross appears on the reverse fine and extremely unusual. S.G. Spec. BS9tf