"FOR HASSELBLAD /60" filters

While looking for Hasselblad B60 filters on various platforms and auction sites, I sometimes come across filters with the text "FOR HASSELBLAD /60" on the ring. For example this one: https://www.keh.com/shop/miscellaneous-brand-bayonet-60-green-3x-filter.html

I don't think they are produced by Heliopan or B+W as Heliopan and B+W always put their name on the ring. And the price does not indicate a Schott glass filter as well.

Does anybody know anything about those "FOR HASSELBLAD /60" filters?

Not sure about the filters but my “research” is that anything marked as such are off-shore knockoffs. I think the “for Hasselblad “ lens hoods are from India or Pakistan. My only complaint is that they are so well made I feel like a chump for buying the teal thing. Back then there was no knock-offs.

I have no experience with the filters but if in that market I’d give one a try. That and a shade…