I'd be interested to see what you find out. I won't ask what the production number is, but I would speculate if it is a late number it could be more likely to have the movement. Maybe they ran out of the standard movements and grabbed a NOS replacement movement to finish off the run. How many people would take off the case back anyway. Another reason for my thinking would be that I recall that some of the early 005's used a long arrow dial that was left over from a previous run. I haven't seen one up for sale in while, but I do know people asked a higher amount for them a couple years ago.