The moon is constantly hit by meteorites itself and with no atmosphere and little gravity larger impacts can always eject lunar rocks into space where some material gets caught by the gravity of earth which ultimately catches the rock and it comes down as a meteoriteto earth

certified on the backside

This official Mercury FDC contains artifacts from every manned Mercury flight on one single cover :

It was retired in 1937

Apollo 10 - moon flown CM Kapton foil

Nicolai Budarin – FLOWN Mirror Soyuz TM-21 USA The moon is constantly hitCosmonaut Nicolai Budarin flown and used Sokolsuit wrist mirror on the first docking Shuttle MIR Soyuz TM 21. Historic flight ! Comes with separate COA by Alacona.