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I just got this one and of course the crystal needs to be polished out, but the question is what battery did it take and how is it supposed to stay in place? Is there a battery holder missing? I can set a 39- negative down on it and press the back on carefully and it will run since the positive contacts the case, but surely that isn’t all there is to it. Has anyone else seen one like this? Steve

 

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There is a clip in ring inside the back cover that may be part of the answer.

 

 

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