Subasta Bidspirit | ✉ CHINA. 1881. SHANG-HAI to

✉ CHINA. 1881. SHANG-HAI to NAPLES (Italy). Envelope franked with FRENCH STAMPS of 10 cts. black and four 15 cts. grey tied by French grill 5104 of Shang-hai. Double rate, very rare combinated franking. Cert. ROUMET.