yeah, i think i got it from the same guy you got yours from, he said he thought it was early 80's, also said something about a few others in texas that have gazelles.
mine is an AB. the brake bridge is kinda high, i had to move the pads all the way down on the rear caliper to get the pads on the rims, but they work. i was surprised that this frame needs a 26.8 seat post too.

your gazelle is nice.