Welcome! This has 3 letters and 4 numbers in the SN, but one with AJ as the first two letters probably shipped in late 1985.
The factory has stated in the past that any steel K frame revolver with a model number is safe for +P; perhaps they thought you were asking about +P+, which is not standardized at a specific pressure and may be hard on a gun. Hope this is helpful.
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Alan
SWCA LM 2023, SWHF 220
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