The Dr. Max Kronstein 25 Year Collection of Postmarked Covers (15 Signed), Rocketry-ASTP. Famous for His Air Mails to the Moon, 595 Total. Dr. Max Kronstein, proved quite the early authority on Rocket Mail even publishing two histories; "Pioneer Airpost Flights of the World 1830-1935" and "Rocket Mail Post Flights of the World to 1986". This collection has just one piece of flown rocket mail, launched the same day as Apollo 16 on a RRI rocket (#508 of 575.) But what it does have is a remarkable collection of postmarked covers, all commemorative issues and many of his making with another philatelic expert in Austria. There are 17 signed covers including Moonwalkers Buzz Aldrin (with Zarelli LOA) Ed Mitchell (x2) Gene Cernan (x2) and Harrison Schmitt.

But Dr. Kronstein earned a highly publicized reputation for sending postmarked Air Mail covers addressed to astronauts on the moon as well as his friend and father of Rocket Mail, Friedrich Schmied