The wife and I are watching the HBO series "From Earth to the Moon", (awesome show) and this one is about Apollo 15. In it, they collect a rock called the Genesis Stone. They make reference that this stone is sample #15415. The wife and I engage into a debate on sample numbering techniques that they were using.

To me, the system there were using is 15 = Appollo 15, and 415 means sample 415. Possibly it's sample 15 of something 4 - be it day 4 or bin 4 or such.

The wife thinks I'm full of it.

So which is it? Can you track down the sample number and if the 15 in the front probably means it's from Apollo 15?