Rich/Cooky would be interesting to find out what numbers are on Cooky's case. I must have the one's on my previously owned version here as well somewhere. Let me dig those up. Maybe we can get closer to the truth in that way.
If these serial numbers are near to each other, I assume that indicates that may have made one or two batches of them. In theory it is even possible that the one Cooky has, was mine in the past ( or even Rich's after some one patched it up again..

Did you note the one's on your's as well Rich?

Ron