1903 marked under side receiver “use in sta 3 only

[Trackflg]

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 number is1477971.would post a picture if I new how, I thought you 1903 guys would be interested. Maybe test gun ???? , looks to be a Greek return

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