That... is what some consider the king of accordions... a Hohner Gola, except hers is not the base model of a Gola 414, hers is a (I confirmed it), model 454, meaning it is a 4/5 reed, 185 bass accordion. The right hand has a 45 key extended keyboard at the right hand and a 126 bass standard stradella system and a 58 note MIII (3 extra rows up top), system Free Bass in C-Griff.
There was one model anove this one, a model 459, same accordion basically except it is a 5/5 reed setup.
Every Gola is commissioned, you pay in full and wait anywhere from 1-2 years for it. Be prepared to pay big money. New Golas today fetch an unreasonable $60,000 US starting point and move up from there. Yeah, nothing short of ridculous.