[DonVoigt]

The receiver was made by Erfurt, the "defect or variance" was noted and either corrected or passed by the RC at Erfurt, at the time the pistol was first made.

Corrected: the receiver is DWM, the mid link(and perhaps the entire toggle) is DWM and is a later replacement.

The pistol is an assemblage of parts, so asking question is fine- but don't expect any definitive answer about when it was done or who
re-worked or refinished it. JMHO.