It is indeed pretty neat!
And correct, the one in the middle is the Fuchs. The Fuchs is definitely the biggest of the three. The one to the right is very similar. The newest one on the left is the smallest of the bunch and is more like the small throat 70H.
Good observation! I just took a look at his photos and it definitely is the same mechanism on his Kruspe.
That tiny guard on the F tuning slide is definitely cool. I haven’t seen one like it before as well, but I’m sure the Conn experts will know more.