177 ARGENTINA - AIRMAIL Auction #2139: ARGENTINA: Mini October sale Block of Four / Cat.#: GJ.636 VF. GJ.636, 1928 5c. red, TRIAL COLOR PROOF, block of 4 printed on thin opaque paper, VF quality, rare! Starting Price: US$ 100 Current Price: US$ 100 Bid US$ 100 or more Closing: 2021-10-21 22:05:00