The one I brought yesterday was the S-mount 10.5cm f4 with a Nikon S. Well I have a couple of the Leica mount Nikkors too Leighton, just to confuse you more Found the Staunton train station pic from two years ago, it happens to be with one of those Leica Nikkors:
Found the Staunton train station pic from two years ago, it happens to be with one of those Leica Nikkors: 