[Ron Wood]

Pepe,
I agree that the numbers are all false. It appears that the entire gun, except for the trigger, has been renumbered. I have a 1900 Commercial, #3453, which is not very far from the serial number of your gun. The numbers "4" and "5" are common to both guns and it is clear that the font on your gun is incorrect. Also, the numbers "1" and "4" should have a lower serif or "foot" which your gun does not have. If you look at the number on the trigger of your gun, you can see what the "4" should look like, and the small "1" inspector's mark on the under side of the toggle knob is what the "1" in the serial number should look like.