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From your pic, I'd say at least VI on the Henckels' scale. That's 100% a regrind, but this does mean nothing: there are wonderful reground blades!! And yours is one.
I guess my #74 isn't a regrind:...

Could you grade the grind with the Henckels' chart?

I found 85 different Cooper working in cutlery between XVIII and XIX century. :shrug: Here a selection of good candidates:

1. John, son of...

..mm.. I remember this auction (about 10 days ago?): I decided to bid low since it was a regrind, but now it looks really nice! Congrats! What could you find about this manufacturer?