I think a lot of people prefer the 686+ version with its 7 shot design, that and people generally prefer pre-lock so I think that puts you -6 timeframe but I'm not sure.

If you're fine with 6-shot, earlier the better. There are also some oddball versions like the 8" barrel with adjustable front sight and the power port models.

Lots to choose from, very popular model. Best resale value is in the pre-lock models and seems like shorter barrels retain their sellability better.

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Joshua Brown(Town)