Welcome (to posting)! The prefix is from late 1985 to early 1986 but the regular production 2.5" model 686 looks to be from 1990, so a special distributor order is possible. Either a letter of authenticity from the S & W Historical Foundation or a call to Lew Horton (who are apparently very accommodating with requests like this) would be needed to confirm. Hope this is helpful.
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Alan
SWCA LM 2023, SWHF 220
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