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Thank you.

This was a mixture between an older SR-51A and the later TI-55, it's inner electronics is more complex than comparable other TI models of the same decade.
My own one is working, but in a less desirable condition, around the power switch, painting is already gone. Also, I had to open it because the display was not fitted correctly (see second picture how to open).


How to open... somewhat tricky, also because the plastic material is a bit brittle.