I think the bit they're referring to would be the "jaws" of the flash sync dial. On most IIIfs (including mine), the prongs used to push the dial around to change the setting lift upwards from the top deck of the camera, making them easier to manipulate. On the one in the right on
@JeffS7444's comparison, they're totally flat to the top deck.
The flat version looks cleaner, but I imagine it'd be a pain to use. Not the end of the world if you only use electronic flash - set it to 2 for a black dial and 0 for a red dial and never think about it again - but an absolute nightmare if you actually use flash bulbs and need to change that setting regularly.