I've never heard of a "Phaser" model snare drum before. I know there were Phaser outfits but in that instance the name just refers to a particular combination of regular Ludwig drums (as do all the outfit names, there were no Hollywood or Big Beat or Pro Beat or Phaser drum lines, they were all the same drums in different combinations and those names refer to that particular combination).
Looking at the 1984 catalog (where they seemed to call almost every outfit "Phaser" something or other) on the Rocker series "Phaser Power" outfit the included Snare is referred to as the "L-600 Rocker Series snare".
I've got a couple of these snare drums and they are decent sounding. I like them as if you rewrap them they are a cost effective way to create a matching snare drum for a drum set. A snare that outwardly looks just like a Jazz Festival.