any info on this "ana4558" op amp i have ????

[missing_dave]

hey all...this seemed like the best place to post this..(admin feel free to repost if not)

anybody know what these op amps are all about?? i know they share the same "4558" as the more common ts type...but the  "ana" before the 4558?? are these some holy grail 45588 or is it just wishful thinking that i have something cool??
it is in an all original year "2000" ptp build by menatone...

[Dragonfly]

i would assume that "ana" is just the manufacturers code, much like "jrc", "rc", etc...