That is an exceptionally beautiful gun, and as Dean says, quite rare. The 3 on the bottom of the barrel lug is the frame size, and the 5 on the barrel flats is the barrel weight. It is an A grade, and if I'm not mistaken, post dates the time when they were graded by their cost.
Please don't be tempted into even the slightest bit of cleaning. When you seek out the advice of experts, you will be hit by sticker shock at what a proper restoration will cost, but believe me, it is a fraction of the guns potential value. A good cleaning by an experienced expert may be all it needs. If the lockplate engraving is in the same condition as the receiver, you don't need anyone chasing the engraving. Thank you for sharing it with us.
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