I got this card 25+ years ago in a used IIGS I had purchased. It came with a CMS External SCSI Drive so I had always thought it was a CMS SCSI Card. Comparing my pictures with pictures of actual CMS SCSI cards has me thinking this is not a CMS SCSI Card.
I have a non-name SCSI card that doesn't like my db25 bluescsi v2. The same bluescsi v2 works fine on my Apple SCSI card. I'd love to send you the card for diagnosis. I can also send a debug log from trying to use it with this card if that helps.