When that happened I'd been working at Tandy (EU version of Radio Shack) for a while and even though we sold computers they were not taken serious until IBM came along and then suddenly we couldn't supply them fast enough.
I've never seen Tandy used outside of Europe but then again, I had not traveled as much then as now so it's definitely possible they used the brand on other continents as well. I wonder how many trees were cut for those catalogs :)