Hello Herbert,
The twenty M1900 'GL' Swiss Acceptance Lugers which were presented as gifts to the Swiss Pistol Commission had features along the lines as you mentioned in your question, however, the rear toggle link should be square. I believe that my pistol serial #13 was one of the pistols presented to a member of the pistol commission and he probably had an Swiss Arsenal change some small parts including the swapping to a wide trigger which is unnumbered on my pistol. It was normal for these changes to occur on these pre-production Lugers and in some cases the barrels were replaced such as with the M1899 pistol #19. Furthermore, some of these M1899 pistols were sabotaged after the trails and exist today in the Thun Museum with mismatched parts from other Lugers.
The sear bar on the pistol shown on page 51 of LAR is a replacement as well as on the M1900 British Test pistol serial #26 (refer to the image on my web site) which was delivered to the British trails of Spring 1901. This small group of six pistols had the stronger contoured toggle links, but still retained the double firing pin retainer springs which were improved later to a single spring when the Swiss received their first delivery.
I hope that my explanation answers your question.
Cheers,
Albert
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