I went on gun broker, and typed in S&W 4013, the 4013 TSW came up and mags, to me looked like the blued double stack only stainless.
I got a positive ID from a dude over on a Smith forum. Smith 6904/6906. To the winner went the spoils. I've no use for it so I'm shipping it out to him this week. Coincidently he's in a neighboring town.
If you're into Smiths I really recommend this particular site. Some really good people in there.-----> https://www.smithandwessonforums.com/forum/