Yes, 1766 was my only option. Sure he was shown somewhere as a watchmaker (can't put my hand on it right now, too late at night!). That's the only reason I went for that option, but I agree it seems a bit early, and I can't find children prior to 1774. My challenge is that I can only get as far as 'Anne'. I don't yet know Thomas' actual birth date, so can't really find a death date (I'll try), but I thought if I can find a definite marriage, that might shed light oh when Thomas was born and to whom.
How can I break this wall of no surname?
Thanks for your help, I'll check in the morning (off to bed now!)

I agree Thomas Owen Bright (son of Thomas)