Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Ecuador - 1929, red surcharge ''50 Cts. 50'' on 10c green, block of four, excellent centering and very fresh, full OG, NH, VF and rare multiple, only 100 stamps were surcharged, C.v. $2,800 as hinged singles, Est. $1,500-$2,000 , Sc. #C6