So this is after the
Eisenhower dollar was already established as a de-facto perpetual Apollo 11 commemorative? Seems like a bit of overkill, so I'm not surprised it did not make it out of committee.
The inclusion of material from Apollo 11 itself sounds cool and all, but one does wonder how that would have actually been physically accomplished in practice, given the possible composition options for a half-dollar. The metallic components of the Apollo spacecraft were made from aluminium, titanium, and steel - not substances that readily alloy compatibly with coinage metals. Further, very little of the actual Apollo 11 spaceship came back to Earth (and essentially none of the Lunar Lander that actually touched the Moon), and most of what did return was still intact as a museum relic (which probably wouldn't have been chopped up just to make coins); many of the "spare parts" for Apollo 11 that could in theory have been used to incorporate into coins would have been kept and used in subsequent Apollo missions, though by 1973 it would have been clear to Congress that the last Apollo had flown, those planned future missions had been cancelled and the Apollo Program itself terminated and wasn't coming back.
Finally, at a 50 million coin mintage, that would have required 567 tons of metal, and the entire Apollo 11 rocket even at launch didn't weigh that much (not counting the propellant). So these Apollo 11 coins would have had to have had a very, very diluted piece of spaceship in them.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis