The "book" is not at all clear on semi-autos (revolvers, yes). I don't have a copy....but I checked one closely in a local bookstore about a week ago (concerning a 3rd gen. Smith semi-auto I have)....and came up short. The book does show general years of production for all of the semi-auto models, but very little about specific serial # range/ production dates. The 5906 may be an exception on this, I don't know, but I wouldn't hold my breath....
I would just contact S&W directly. That is what I did.
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