I haven't found any connection yet between Griffin Owens and John Owens, Watkin Owens father. I have found some snippets of info which i shall share.
John Owen b.1719 Llanwrst, married Elizabeth Jones of Eglwysbach, 1746. John Owens died 10 Feb. 1776 age 57 years. There was no will, son Watkin Owens. John Owens lived and worked at Tyn-y-Pwll Llanwrst it was a house and workshop. landlord was Peter Titley of Penloyn.
I found a Liverpool grocer named Robert James Owens from Llanwrst eldest son of Watkin Owens Llanwrst Clockmaker.
There were 8 Clock and or Watch makers with the name Owens in Llanwrst (sorry keyboards86, damn Owens)
They were, Elizabeth, Griffin, Humphrey, John, Robert, Watkin, William,Hugh.
Watkin Owens married a Margaret Ellis 8 Dec. 1779. there are a number of Margaret Ellis born Llanwrst so cannot pin her birth down to a particular year.
During this search i found that a Watkin Owens Long case clocks would cost at least a years salary, so not cheap.