Sorry to be late to the thread, but as the owner of that one and only a la carte IIIf, which is a black dial, let me say that they are fine shooters.
Not a big issue, but I like the shutter speed progression on the IIIf BD, which has as mentioned black paint in the engravings for the flash delay. I keep synch dial set at the number 2, just in case that I should ever feel the urger to use a flash unit someday.
The shutter speed progression on the black dial IIIf is 1, 2, 4, 10, 15, 20, 30, 40, 60, 100, 200, 500, 1000, B.
The red dial shutter speed progression is 1, 2, 5, 10, 15, 25, 50, 75, 100, 200, 500, 1000, B. It's flash synched at 25, with the synch dial set to 0 and at 1/50th, with the synch dial set to a 20 millesecond delay.
The IIIf comes both with and without a self-timer lever.