I have a Rolleiflex 2.8E(1) with a Xenotar 2.8, and Synchro-Compur shutter, it's serial number is 1.637.029. Everything a normal E(1) model has... except no meter. It has the studs for the diffuser, but no meter and no scale on the focus knob. I can't explain it. I know it's not an E(2) or E(3) as they have much later serial numbers and different features which this camera does not have. Could it be a one-off E(1)?