Anna,
An "in-the-white" frame interior by itself may not indicate a factory-original finish.
There have been in the past and there are some very skilled re-finishers still currently working...that do not make that mistake on guns that should be "white".
The recreation of the "polished" area under the thumb safety is also a pivotal sign of their rework skills. Some do it well so as to go undetected...others are still struggling with the technique.
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