The two-letter date code on the right side of the frame, below the accessory rail, indicates the year in which the frame was made:
For 2004 and later P99s, including the P99c (Compact), the datecode is located on the frame under the accessory rail, as shown in the photo below:

The following is how to translate the letters into digits, which then correspond to the last two digits of the year:
Thus, an "AE" P99 was made in 2004 ("AE" = "04").
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