I just bought B+W XS-Pro UV Haze MRC-Nano 010M Filter (72 mm) from B&H and found that it is a used one since there are many visible scratches on the ring as the picture.

I applied shadow protection to make the scratches clearer
After I found the scratches I carefully scan the filter for other noticeable flaws. Then I saw some black stains around every letters of the printings on the filter ring. It seems like some kind of low quality printings as the picture below.

I applied shadow protection to make the stains clearer
From what I found I have a doubt if my filter is a fake one. I am a beginner so I am not sure if I can tell it is real or fake from looking at my photos using the filter. I read from many websites that B&H is a trusted website to buy cameras and stuffs. After googling, some people said to check the weight but no one actually mentioned how much weight is the real B+W XS-Pro UV filter for any specific size.
(FYI my 72mm XS-Pro UV weighs 31g.)
My question is:
1. Do real B+W XS-Pro UV filters have similar black stains around the letters?
2. How much weight is the real B+W XS-Pro UV filter (for any size)?
3. Is my B+W XS-Pro UV filter real or fake?

I applied shadow protection to make the scratches clearer
After I found the scratches I carefully scan the filter for other noticeable flaws. Then I saw some black stains around every letters of the printings on the filter ring. It seems like some kind of low quality printings as the picture below.

I applied shadow protection to make the stains clearer
From what I found I have a doubt if my filter is a fake one. I am a beginner so I am not sure if I can tell it is real or fake from looking at my photos using the filter. I read from many websites that B&H is a trusted website to buy cameras and stuffs. After googling, some people said to check the weight but no one actually mentioned how much weight is the real B+W XS-Pro UV filter for any specific size.
(FYI my 72mm XS-Pro UV weighs 31g.)
My question is:
1. Do real B+W XS-Pro UV filters have similar black stains around the letters?
2. How much weight is the real B+W XS-Pro UV filter (for any size)?
3. Is my B+W XS-Pro UV filter real or fake?