Lot 41120 – 1896 Proofs by E. Mouchon of the 1g blue in a sheetlet

1896 Proofs by E. Mouchon of the 1g blue in a sheetlet of 8 stamps on yellowish wove paper with SPÉCIMEN ovpt, which were for a planned issue of new stamps and postal stationery dies and used for postal stationery, a little foxing, unrecorded in literature and possibly unique, photocopy of cert. Sismondo (2012) from a group