From what I can see, I see no screws whatsoever looking downwards
The flange I'm referring to you can already see in the pic I posted above. (the C to the left there)
The side of the lens definitely says "P/K' so I can't imagine it's wrong... gimme a sec and I'll take a pic and add to this post
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Ok here's a pic of the mount looking straight down
FYI this is a Vivitar Series 1 70-210mm 1:3.5, Macro Focusing Auto Zoom, No. 22740765, with a 67mm filter ring. It's also got VMC in blue letters written on the the rim as well.
There's two funky side bits towards the back protruding on either side, one with a plastic white button you can press but I have no idea what pressing it does...