1903a1 Springfield Serial Numbers

I just purchased a 1903 Springfield and have a couple questions. My book said the 1903A1 serial number range was approximately 1.2 to 1.5 million with a Type C stock, etc. This 03's SN is 1,505,XXX. It has a SA barrel dated 8-42. The bore is dark but has lots of rifling. Have started the cleaning process and hope it slicks up. Stock has a nice dark red color with nearly no skuff marks, etc. From the books description it is a WWII type C stock. It doesn't have any cartouches or finger grooves and feels fat in the grip. Why is the SN above the highest range in the SA book references. Did SA build several thousand extra receivers and build rifles on in to the early 40's? Any history or references on this range of high number Springfields would be appreciated,
1903a1 Springfield Serial Numbers

1903a1 Springfield Serial Numbers List

Model: 1903A1. Serial Number: 1498118. Year of Manufacture: 1937 (page 370 of Joe Poyer’s book, The M1903 Springfield Rifle and its Variations) Barrel Date 3 – 37. Caliber:.30-06 Springfield. Action Type: Bolt Action, Internal Magazine. Markings: The top of the receiver is marked “U.S. / SPRINGFIELD / ARMORY / MODEL 1903 / 1498118”. The lower lip of the muzzle is marked with a “star”. M1903, M1903-A1, M1903 serial numbers, owners manual, m1903 for sale, for sale,bolt action, Springfield m1903, values, A2, A3, A4, m1903 prices, rifle m 1903 Gun Collections Online Specialists in Marketing Your Gun Collections.