I only have the one source of info on this. Can’t say it’s the definitive reference, but maybe it is. Noted was the variations in turret designations, both 2 and 3 lettered, used as system identifiers, that oddly, were not consistent throughout the war. Much like US designation variables. A potential “remote control” identifier for this turret is the lack of the ring and post sighting arrangement, pictured on other options. Unless it was taken off for the photo, and the mechanics visible through the glass that replicate exactly that pictured in the book, and the fact NOBODY would want their head that close to the action, I’d bet it’s a photo op in a FDL.
And then there’s this: ww2aircraft.net/forum/weapon … 368-2.html
Having perused a couple more tomes on the subject, I am led to believe this is a “manned” vs RC turret. Only one reference says otherwise. Out of 4. Found the same pic in two of the books.