Lot 40059 – 1866, 50r blue on bluish paper, featuring the « filigrana de sutura »

1866, 50r blue on bluish paper, featuring the vertical « filigrana de sutura » (« suture » or « stitch » watermark), presumably unused without gum, couple of surface scuff spots, not detracting from this most probably unique watermark variety on bluish paper; ex Dr. de Amaral Machado.

Note: The « suture » watermark is caused by the splicing of the felt that carried the wet paper -during the process of its manufacture-, which was made with metallic threads. It is an accidental filigree with the appearance of a suture, when the stamp is examined in benzine.