Help with Savage No4mk1* with 0C0### serial

[Roger Payne]

My memory is dim, but this rifle has five digits after the C which suggests to me that it isn't an early rifle at all, but a late one. I'm no expert on Savage serials but wasn't it the case that towards the end of production (when they got to a million???) they started again at 0C but with an extra digit to the right of the C in the serial number.............?