: I'm not sure it's that difficult to imagine actually. If this
: version:

Well, I admit I was trying to stir the pot a bit. I agree that they are most likely both factory variants.

: I don't
: know if the serials bear out an order for the dial variants?

That's a great idea to check them against the serial numbers. Unfortunately my database contains only two examples with confirmed serial numbers, so for the moment it is of no use.