I bought this lens on ebay, and it arrived today. It is the old version with marking inside filter ring. I also have an NW 250/6.3, and I was surprised to see that the 6.7 lens was smaller and lighter than the 6.3, despite the much bigger coverage.
I was even more surprised when I put the lens on my camera, because it turned out to be much wider than my 6.3 lens. I used a DSLR to roughly establish the focal length of the 6.7, and it seemed to be 210! Measuring the bellows draw at infinity confirmed this - excactly 210 mm.
My first thought was that the lens had been wrongly marked at the factory, but then I found out that the W 210 should have a 58 mm filter thread - this one has 67. The only other thing I can think of is that the rear element is not original. (there are no markings on it)
Weight of the lens is 480 g, rear element is 26 mm long (measured from the lens board), and has a diameter of 60 mm.
If anyone who has this lens could comment, I'd be really grateful. Part of the story is that I'm also looking for a W 210, so I'll make some test shots tomorrow.
Attached photos from the ebay listing.
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