SWITZERLAND. 1857, Sitting Helvetia ("Strubel"), 10rp blue, carmine silk threads on thin paper, Bern printing on thin paper 0.05mm, wide margins all around, exceptional quality used. Nussbaum and Hermann certificate. Zumstein 23E.b. SBK 23B3mm.b; 600 SFr. (Photo). Est. 300 - 400 CHF.