If it is really 'AA' (Accurate Arms Co.), it's an old powder predating 2003 when Western Powder Co bought the Accurate Arms Co and changed suppliers.
AAC was originally a buyer /distributor of surplus military powders, just like the early Hodgdon. Its earliest grades included a fair pile of such powders from Israeli sources including the very original AA-2520 ball powder. That would be around the 1980s, maybe early 90s. This version of 2520 soon acquired a great reputation amongst XTC M1A 308 competitors loading 168gn SMKs, so much so that it was nicknamed 'The Camp Perry powder'.
When that source dried up, AAC turned to Explosia in the Czech Republic for this and other grades. The M1A shooters quickly found that although claimed to be identical to the original surplus product, it wasn't and didn't perform nearly as well. (Not the first or last time this has happened, cf surplus IMR-8208 vs new ADI-manufacture 8208 from Hodgdon for 6PPC in short-range BR!)
When Western Powders bought AAC ca. 2002, 2003, it quickly ditched Explosia as a supplier. Tubular grades mostly came from General Dynamics Corp Valleyfield Division in Canada (which makes the legacy IMR grades for Hodgdon); ball powders mostly the same corporation's St. Marks Powder Co. operation in Florida, although it seems 2520 might have been supplied by Eurenco P.B Clermont in Belgium which manufactures the Ramshot ball powder range for a period. (In any event, Western's published loads data for Accurate-2520 was identical to that for Ramshot 'Wild Boar', a Europe only Ramshot grade, down to 0.1gn loads and 1 fps / psi results.)
Around the time of the AAC to Western changeover in 2003, the brand name on the tins was changed from Accurate Arms to simply Accurate. (AAC pre-Western may have started this shortly beforehand.) In any event it's not too far out to generalise that if the can label says Accurate Arms, it's Czech manufacture; if simply 'Accurate 2520', it's later from St. Marks. Although similar, they're not the same and pre-Hodgdon the old Western Powders used to warn European handloaders not to use its US 'Accurate' data for the Czech powders which remained available in Europe (under the Lovex trademark name).
After 15 or so years without the Czech versions in the US, many reappeared under the Shooters World brand with new names for individual grades. This included AA-2520 / Lovex D0-73.6 which the company sells as SW 'Match Rifle' and provides loads data for.
https://shootersworldpowder.com/match-rifle/
