Just as the title say, what does gtr encl mean? I've seen it referred to on several cabinets.
i would guess it means 'guitar enclosure'. some people call a speaker cabinet an enclosure.

not 100% sure though, but it seems like a public listings shorthand.
punk isn't dead, it's always smelled that way.

"A perfection of means, and confusion of aims, seems to be our main problem."
Ah, brilliant! I'm such a dope to not have figured that out. I believe you are correct.