I personally don't see anything odd with N marked vs no N, as Mike said anything is possible. I think we sometimes forget companies that are in the business of making products, and getting them out the door in the shortest time possible aren't going to sweat over a stamp such as this, because once it left the factory was really had no other purpose. Since the OP bought his gun new there is little doubt about it being original. It is a beautiful gun, and Donald must have more will power than me I would have had to shoot it

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Randy