Cadillac power window switches found in junkyards are among my priorities pulling. Never seen any mounted vertically, single or group. Hard to tell detail in this shot, are the switches themselves slightly rounded, and having knurled scallops? If so, I removed perhaps an identical driver's power window switch from a '51 or '52 Fleetwood in NM a couple years ago.
Sorry about the pic, should have gotten closer. Yes, exactly as you describe. This is the drivers door, with the four vertically mounted. As I remember, the passenger door has a single horizontally mounted (don't hold me to the mounting position.) The passenger side rearward door has a group of two switches mounted just inside to left (interior of the C pillar) - I have to assume for the windows in the back doors. I wasn't smart enough to see if that was duplicated on the drivers side. I remember for certain that group of two was horizontal, I just hadn't realized what they were for at that point.