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No very clear ( use in sta 3 only) all letters are the same except the 3, looks as if they made a stamp that said use in sta only and filled in with number stamp for what ever station, ??? The...

Hello all, first post , I think.
I have a 1903 with markings on the underside of receiver at flat piece just aft of forward mounting screw , stamped into receiver the words.use in sta 3 only. Serial...