The 18 Swiss stamps of the Seated Helvetia design shown above were issued between October 1862 and June 1863, with various printings continuing through 1881.  They are all printed on white, wove paper utilizing the Cross-in-Oval control mark Type I.MiNo: 20,21,22,22,23,23a,23b,24,24,25,25,26,27,28,28. Cat. € 554.00 all used VF