"Krag 1902": Welcome to the KCA Forum! If you post some pictures of your Krag's markings, you will probably get improved feedback.
I believe model 1898 and model 1899 Krag bolts are totally the same. I am aware of no source material that identifies the stamps that occur on the bolt handle.
I do have an inexpensive sporter that was put together by Sedgely Co. The rifle was marked with a small 'circled S' on the receiver ring. It was rebarreled using a salvaged .30-03 barrel that came off a model 1903 Springfield built in 1905. The only marking on the bolt, which was specifically fitted to this barrel, was a "4" on the bottom of the bolt root. There are no holes for sight screws on the barrel, but, the remains of notches for 1903 sights (The original top of the barrel is now the bottom). Maximum bore diameter is .308".
If your barrel came off a Vicker's Machinegun, I would expect it to have some British markings and the bore to be .303 (land to land) and .314 (groove to groove).
I photographed three bolts (two from model 1898 rifles and one from a model 1899 carbine). The bottom of the bolt root had a single character (one had a '2' and two had a faint 'V'). The backs of the bolt root had the following combinations: (S,2,five point star, and 6), (A, E, and Z), (s, X, 6).
I have no insights into the bolt markings.
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