I have heard a rumor that the Monster Alpha Genesis was a cartridge made by ZYX called R-100. This R-100 is currently available from ZYX. I cannot confirm if the rumor is accurate, or not. I have not compared them.
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From what I've read the ZYX R100 seems to be an evolutionary version of the Alpha Genesis 1000. The price points are similar and both were designed by Hisayoshi Nakatsuka.
I also miss the AG 1000 - I had 2 of them during their heyday. Nice, accurate sound from an $800 cartridge. Very easy to listen to. I still have a Sigma Genesis 2000, but never liked it as much as the AGs.