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Although it didn’t come in the original packaging, this electronic calculator looks like it has never been used:  There were no signs of impressions on the ink ribbon, nor ink on the digit role or signs of use on the rubber role.

It easily opens by removing two small screws at the back and two on the front-side bottom.  The key assembly is connected to the PCB with several connectors.  By loosening the front one, the PCB becomes visible as shown in the pictures.