If the camera description is that inaccurate, I would also question the lens... Real fake Zeiss Sonnar are easier to find than genuine ones, not to mention the opposite (real Russian lenses with German glass)...
In this regard, I have an interesting story about 2 Zeiss Sonnar lenses with the exact same serial number: one in LTM, the other one with a Contax mount. LTM Zeiss Sonnar are pretty rare but this one was clearly identified by some specialists as genuine. I own the Contax one and it bears the Zeiss engraving on the barrel of the rear group. According to the serial number, it is a wartime lens but I bought it with a post-war Contax IIa... Strange isn't it?
So, which one is genuine: The rare but clearly identified as such LTM Sonnar or my Contax Sonnar? Honestly, I don't know...