That is a standard feature... It is the takedown lever spring. It is L-shaped and the small leg of the L protrudes slightly through the trigger guard in your photo. The long leg fits into a rounded and shallow groove in the bottom of the takedown lever to keep it closed when in the firing position.
What makes you think this is a commercial pistol? A commercial Mauser pistol would have the Mauser Banner logo on the top of the toggle. The S/42 is a wartime code for a military or police issue pistol.
What are the inspection marked stamped in the chamber area of the upper receiver on the right side?
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regards, -John S
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