So yeah, you are experiencing the ultimate holy grail in extreme grindcore metal. This 1990 Anal Cunt longsleeve with smaller version of AxCx front logo is from before the band was signed to Earache Records, and these were hand screen printed by MR. Seth Putnam himself (also most probably their first design t-shirt). So, yes, for sure there aren't many left around, even less in this flawless condition. Just a small stain at the bottom front as pictured. Fruit Of The Loom black old tag size XL, single stitch.
Measurements
Pit to pit: 22.5"
Back to hem: 28.5"