Dating a bolt

I was trying to date the bolt in my 1903 #1374814 by looking at the vishooters site but coudn't quite figure where mine falls. The bolt has a #6 on the underside of the handle, a "us" on the front of the safety lug, and a lightly struck "S" on the bottom of the safety lug.
What time frame was it made and what would be a more period bolt for the rifle? I put the rifle back into full military configuration about 30 years ago before there was so much info available.
Thanks.
john

That's a puzzler for sure. Is it a straight handle or a swept handle? Can you show pics of the markings?

It's a straight handled bolt. I'll take some pics and try to up load them.
john