The information you received from the other forum is correct. I was going to mention the same lack of a stock lug as well as no chamber date. It is one of the earliest issued guns.
Is the toggle being held open by corrosion or is there a "hold open" device keeping it raised as in the photo? There is no clear indication from your right hand side photo that a hold open device was added, which did not come on these early factory guns. The photo is not sharp so the added hold open pin may de there, I just can't see it.
The drilled hole was done by someone other than the factory. There should be no hole in that area at all. Maybe an attempt to "add" a trigger by someone who did not understand how the mechanism works or for display purposes?
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