Not an expert, AC 44 means it was made by Walther in 1944. AC (Walther). Going by a book i have, i believe the I is part of the serial #.It says serial #'s ran 1 to 9999. Then they started over 1a to 9999a and so on. This from a book (Know your P.38 pistols) by E.J. Hoffschmidt.
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Roger
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