Lot 61524 – 1867 5c green, an extremely rare franking with two examples in clearly contrasting shades

1867 5c green, two singles from different engravings and in clearly contrasting shades, both large margined and used on 19.4.1869 entire letter from Tupisa to Cobija, tied by blue « TUPISA » straight-line handstamps, with Potosí transit cds on reverse struck four days after dispatch, an extremely rare first-issue cover bearing the same 5c denomination in contrasting shades emanating from different sheets.