This Grumman Removal tag indicates that the Lunar Surface Sensing Probe had been installed on a Lunar Module, “Vehicle No.
39.” This was LM-9, an early LM design originally intended for the Apollo 15 flight. LM-9 was replaced for Apollo 15 with LM-10, a more advanced design which could carry more equipment, including the Lunar
Roving Vehicle.
The reference designator block is overwritten by carbon ink from the date written on the back of the card. But
removing these characters reveals the reference designator “-Y,” indicating that this sensing probe had been installed on the left landing gear (when facing forward in the LM).
The back of the tag indicates a weight of 2.55 lbs. Its current weight of 2.52 lbs probably results from the
lack of a cover plate on the switch access port.