I don't think any of the Nettars have strap lugs. None of mine do, although I don't have the 517/16. Nettars are bottom of the range cameras and tend not to have any frills at all.
I have a 517/16 here next to me. There are no strap lugs of any kind. There is a tripod socket though, I suppose if you're desperate you could use a BlackRapid strap. Lovely camera, a real pleasure to use.
My 516/16 has lugs, and I found some photos of the 515/16 with them, but I suppose they could be post-factory additions. The 518/16 that I regularly use doesn't---I think the postwar models are expected to be used in their leather never-ready cases.
The 6x6 size is pretty comfortable to carry around in one hand, though. I can fit them in the back pocket of my jeans, but I have a large American butt.