A couple of years ago, on one of the various "cable" channels, there was an interesting show about the Reggae Culture in Jamaica, and this showed a number of very active small "cottage industry" vinyl-pressing factories. These produced only 45s, as I didn't see any LP albums. Everything was definitely "low tech" and there was quite a bit of ingenious "backyard engineering" involved in the process.
They even practiced a bit of " being green", in that they would recycle and melt down old and damaged records and re-use the melted vinyl goop for pressing new ones.
So there is a good chance that most of the 45 year old "Bottle Head in Fine Style" 45s have been "reincarnated" one or more times.
/ed B