Instead of going side to side in unison, the wipers go toward/away from each other. You'll find a similar setup on 60s and early 70s Mercedes Benz models (at least on some), and some late 50s
Back in 1974, with my new-to-me '62 Ambassador 400, the resemblance to the same-year Mercedes-Benz was obvious. Clearly not a coincidence! There's all sorts of parallels and similarities.
62 to 63 is a real sea change in style for AMC, they dumped the stodgey and got modern.