Hermann,
Thanks for the additional pictures. The lack of a mark on the rear toggle piece does not illuminate the question. However, the fact that this used to be a Navy means that the rear toggle piece has been replaced. I have a parts gun on which the toggle train does not match the receiver; it has a slight gap in this same place. I suggest that the part on your gun, not being original, is simply a poor fit.
I am intrigued by the beveling of the back edges of the part.
--Dwight
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