Found a 1970 D Half Dollar in a box this AM

I was sorting halves this AM and found a 1970 D half dollar. Looks like only 2.15 million were minted so assume these are hard to find 

Base Metal & Precious Metals Forum
https://realcent.org/
Pennysaved wrote:Why were so few minted that year? Was it because they knew they were going to stop making 40% in 1971?
Pennysaved wrote:But why do you think they only made the 1970s halves for Mint or Proof sets and none for general circulation? Was it because they were preparing for the conversion from silver?