Saw a Model 19-3 in nickel today on offer that seemed in pretty good condition with a reasonable price ($750). But about 1/2" from the tip of the barrel there was what I can best describe as maybe like an orange peel or some sort of crusty stuff (still in nickel) that was in the shape of about a 1/4" rough elipse. At first I thought it was just some sort of crud but it did not seem to want to wipe off. I wish that I'd felt comfortable enough to take photos. Unlike on a blued gun that had lost its finish this little area that again was roughly a 1/4" inch eliptical shape felt sorta rough to the touch vs smooth like on a blued gun lacking its finish. You guys have any idea what that could possibly be?? My concern was: Is rust going to eventually form under this rough area. Wish this question sounded clearer. My thanks in advance for your response