Welcome to the forum.

95% might get you a very rough ballpark figure. But one person's 95% estimate may not look like everyone else's, nor does it confirm if it's 95% of the original blue, or the 2nd or 3rd re-blue.

Not a lot different from evaluating cars; good photos, details and accessories are everything.

Take to a gun shop and have them look it up in the Blue book of gun values. Then take to another shop and compare results.

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Jim
S&WCA #819