smile face and replacement screws
I can see how you could think that the shinny pins are replacement screws showing through.
I think this is just the way it is. There is no evidence that these are anything but pins that pass through the with of the action.
As for the smile face with the name of Henry Vogt Chicago,
I wonder if this is a cocking indicator? I agree it sort of detracts from the engraving but it is what it is.
Knowing that it is a Franz W. Kessler Prussian Guild gun is more than I started out with. Considering that another poster found a shotgun with Henry Vogt of Chicago on it. makes me think that this was a retailer for custom guns.
No matter if 1926 or 2010 this gun is not one that the average hunter would have purchased. It may have collector value that far exceeds the value of the working gun. There may only be a hand full of people with the money and appreciation and the desire to own it.