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I had heard that before. Then, someone who had a June birth certificate with their knife said that theirs was marked "A". There were also folks who said one side of the knife said "A", the other said "B". That's how I got confused and why I asked the question here. From the exactness of your answer, I'm going to go with your explanation.
The marks on the inside of your knife are machining marks. The 03 does correspond to the year the handle was machined and the letter refers to when in the year it was made. A being the first batch, B the second, etc. Your handle was machined in the first batch of 2003.