Posts: 73
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Joined: Jan 1970
Where ????????????????????????
Posts: 1,788
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It may be a red dot or a photo artifact. The dot appears to be too low and ill defined for a real red dot, but with the quality (or lack thereof) of the photos one cannot tell.
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I once worked on a very early HP-35 that was not a red dot machine. The on/off switch had a red dot on it! Obviously, HP had a few switches with red dots left after doing an engineering change that removed the see through hole. Another interesting fact was the cpu board had sockets instead of the through holes on later HP-35's. There were some other differences such as the rear label. One way to check the validity of the machine would be to see if the cpu board has the sockets.