Congratulations 00Buck2 on your acquisition of a beautiful Model 18-3! I found one of these last December, also a 6K serial series, and also with TT and TH. Here's a link to my original post.
I found a Model 18-3 today!
I have since replaced the stocks with a new set which I acquired from forum member Masterbuck54. I happen to like target size stocks on my K and N frame guns.
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Like you, my Model 18 has become my favorite S&W Revolver! Enjoy your new Model 18!