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This incredible, Apollo 13 Flown ALSEP Pin depicts the use of the Apollo Lunar Surface Experiment Package, and measures 3/4 x 3/4 inches (19 x 19 mm). The pin comes attached to a mylar sleeve card which is addressed to Mr. George Franklin, and has been hand signed by CDR Jim Lovell, CMP Jack Swigert and LMP Fred Haise. It reads: "Please accept this ALSEP pin flown to the moon 11-17 April 1970 on Apollo 13 spacecraft as a token of our appreciation for your efforts before and during the flight." Together with an affidavit from George Franklin.
As with such Apollo flown pins, this ALSEP Pin never had the pin back soldered post-flight, leaving it with a smooth, flat surface on the rear side.
The Apollo Lunar Surface Experiments Package was made up of scientific instruments which were intended to be placed on the lunar surface by the Apollo astronauts at each of the Apollo landing sites. Apollo 12, 14, 15, 16, and 17 were successful in the deployment of their ALSEPs, but unfortunately due to the oxygen tank explosion during Apollo 13, they were not able to land and deploy theirs. The Apollo 13 ALSEP was comprised of the Passive Seismic Experiment, Lunar Atmosphere Experiment, Charged Particle Lunar Environment Experiment and Heat Flown Experiment, all of which can be read about here.
You can read more about the Apollo Lunar Surface Experiment Package here.