Some might pay more for a "no dash", but generally, I've not noticed they command a premium over other pre-lock 686s. More important is condition and fit/finish.
FWIW, I may go against the grain, but my personal "most desirable 686" is the -5. It was a transitional version, so it's the only one that's pre-lock, but with newer features, such as frame-mounted firing pin, pinned front sight, new style cylinder release, and non-recessed cylinder.
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