(Aided by Google...), but considering the gold trigger and hammer − which plating was almost certainly aftermarket − it seems at least possible that the "crown over a C" is s hallmark designating silver plating on the rest of the gun.

"References"
• Silver Forums at 925-1000.com (First "hit" on Google...)
• Online Encyclopedia of Silver Marks, Hallmarks, & Makers' Marks (First answer in thread...)

See the "MC" set of "Unidentified Silverplate Marks", fourth from top on the left. (NOTE: Site images are copy-protected, so I didn't try to repost them here. You have to visit the Encyclopedia website to see them.)

Since the "MC" set includes a "crown over a C", and because it says "Unknown probably USA" right next to it, I thought it worth going to all this trouble to post what is basically a WAG on my part.

Hope it helps.

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Unless it's poorly done (for example, over-buffed), I'd probably buy it for $800, change out the hammer and trigger, and call it good.

VERY good, actually, but that's just my opinion; I have no problem with "white" guns and have approximately equal numbers in both traditional colors.

A good '55 Commercial Goverment Model is a bargain at $800, but it isn't worth anything to me if it's an over-buffed wreck, or what have you.

None of my current, very small collection of white guns is "high-polished", but I've owned them before, and I still like them if they're done right.

The gold, though, would have to go. (lol)

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If it hasn't tarnished in over a year in the case, then it likely isn't silver. Having said that, countless old 45s have been stripped and nickel plated with gold cooterments. Texas lawmen loved them and they used to be thick here. So just make double sure it's not such an old redo. In these parts, $800 for such a thing would be around $300 too much.

JLF