Bidspirit auction | Worldwide Aerophilately - Mexico

Worldwide Aerophilately - Mexico - 1929, Eagle, imperforated proof of 25c in green and brown, block of four, minute gum wrinkle on one stamp, fresh condition otherwise, full OG, NH or previously hinged (2), VF and with high probability unique multiple, Sanabria No.14, only 50 stamps were issued, Sc. #C3