I still have the first DC Wood Duck call I ever bought. It was my first piece of duck hunting gear. Still have it, which now that I think about it is shocking. It's at least 10 years old and still perfectly functional. Sounds better than any other one I've tried. Most of them don't even remotely sound like a real wood duck.
That's probably my only hunting possession that fits the criteria.
But, I have a cast iron skillet that I bought new when my wife and I were still dating. Its been around over a decade. Bought it to fry some mullet in one day because we caught some and were going to cook at her place and she literally didnt have a skillet in the place.
I assume it'll be feeding our daughter soon.