Hi Guy's The current debate has produced a growing list of differences between the front panels of just one model viz and towit the PDP-8/e Here's my list so far 1. Angle of selector switch positions 1 and 6 can change (change of switch detent angle) 2. The line around the switch position area can be present or missing 3. The lines splitting the lamps into groups of three may or may not be present. 4. Diffences in colour from machine to machine (not verified yet) These could be related to 1. Date of manufacture 2. Place of manufacture 3. Serial No 4. Option fitted ie programmers console change of switch type It would be nice to be able to correlate the one list with the other Suggestions plese gentlemen The current shipping panel has the line around the switch area and the lines in switch positions 1 and 6 are vertical Regards Rod