After January 1, 1907, the rifles were basically newly manufactured as came off the assembly line not made up of misc early parts. Below is a sampling of the first year of normal production. Per "Springfield Model 1903 Service Rifle" by John Beard and C.S. Ferris
Is the serial number close to any of these? Ray
Serial number Barrel date
63499 4-07
65975 3-07
71587 4-07
87229 6-07
94160 8-07
Interesting info Ray. I have a bare receiver Serial # 71288. Appears t have original finish.