I purchased a minty used Canon 35mm f/2 IS lens which has a 67mm Digital Advance Pro CPL by Japan Optics included. The gent from whom I purchased the lens and filter told me that he paid one hundred U.S. Dollars for the CPL.
I had some serious doubts about this but I did a Google search and came upon the website for Digital Advance from Japan Optics. They have some seriously expensive filters listed. I couldn't find the Digital Advance Pro 67mm CPL but did find a Digital Advance Ultra HD Pro CPL Filter listed at $249.95 That's a hefty price for a 67mm filter.
It's quite possible that he did pay a hundred bucks for this filter. But, OTOH, this might be a lower grade filter from Japan Optics. Even B&W and of course, Hoya, have their various grades of filters. It might be a Chinese knock-off also
Has anyone ever heard of Digital Advance filters from Japan Optics?
BTW: I love a 35mm prime on a full frame camera. This lens on my new 6D2 will probably be my go to low light outfit...