I was at an estate auction recently. Bought a Sig 229 .40 S&W, something I've always wanted but the stars were not in alignment till recently. Got a good look before and after the auction and the gun looks 95% or better. Only problem is when I got home my wife said "that will be your Christmas present"

I'll have to wait to shoot it or get a better look.
My concern is the frame says Made in Germany faintly embossed. The slide has "stainless" on it but it isn't bright, silver looking like a typical stainless. The only 229 listed that I can find with stainless on a slide is the DAK model used by Homeland Security which is DA only. Mine, or what will be mine, is single & double action. I didn't get a look at the SN to see if they match or even know if any of them match on any guns, or even know where to look before it got squirreled away. I suppose, given an auction of used guns, I could have a mix & match slide and lower. I did check the trigger and SA breaks at about 4.5 lbs, DA, as I recall a bit over 8 lbs.
It came with case and booklet and magazine that says 40 S&W or .357 Sig on it. Seems I could get a .357 Sig barrel if desired.
Any ideas?