Hi,
To make things worse there are also the documented 'arsenal refinishes', where guns are both politically correct and show signs of refinishing and repair.
So depending on the environment the gun came from, it's not always recommended to discard a gun as a collector's piece because it shows signs of reworking/repair.
Knowlegde of techniques, timeframe, contracts, use, the paper and stamp trail, parts differences, number sequences are vital.
Forums like this one give you the opportunity to study a great deal of guns in detail.
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