I bought a near mint 4" for $450.
Same answer as every other post like this. It depends on the vintage and condition, is it a low production version. A mint condition M29, M29-1, M29-2 is worth a lot more than a beat up late model. The price range based on your wide open criteria is $500-$2500.
If you're looking for a realistic price for a very nice M29-2, which is still collectible, but not a safe queen you're afraid to shoot, I'd say $900-$1100 range.
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