I would contact the eBay seller and ask for either a slug photo or a type sample, or at the very least a reason why they are claiming it to be distinctive. Many typewriter ads are written by those who don't have any knowledge of what they're selling and consequently you have to take most of it with several grains of salt.
With respect to Georg's Amata (in the Database), the last gallery photo shows that it's equipped with what appears to be a very common typeface:
