Lettering on it does say D.S.S Ltd so that would point to some variant of Deep Sea SealThe rubber bit does look like a Deep Sea Seal but I've never seen the metal cowl/clamp ring thing before; perhaps the larger sizes had that to create more axial force on the seal face.
I think you will find this is a commercial Manecraft seal based on a John Crane design and originally made Deep Sea Seals. Face seal like the later design used on smaller boats.more photos if anyone can help
yes but they dont make these anymoreThat’s a Crane Seal as fitted to Fairline boats .
Try these people. They might have the knowledge and deal in these seals.yes but they dont make these anymore