For what it's worth, I have a Sedgely 'style' Springfield that looks similar. The barrel has an "IJ", WWII 03 replacement barrel.
Edit - dug this out of an old thread from a few years back.

Does yours have anything stamped in the bolt track on the receiver tang (Sedgely serial numbered their's there, IIRC).
[/quote]
Hi Story,
can you post a link to the old thread discussing your rifle. I looked at mine, and found nothing stamped in the bolt track.
I have two other Sedgley's, a 1917 barreled action discussed in the link below
1917 Sedgley And a 1903 discussed here
1903 Sedgley The 1917 action has the number "459" stamped on the safety housing.
The 1903 Sedgley has no number on the bolt track. This may be because the rifle started off as a National Match and was probably sent to Sedgley to be stocked and have the scope put on.