Douglas watch and clock makers

[William Douglas]

There appear to be two separate branches of the family tree who were watch and clock makers. but are they separate? Or is there a 'missing link' that binds then together?

I found these two extracts, but please note that details here differ from records in the Douglas Archives!

James Douglass was born around 1730-1733 to John Douglass (unfortunately I don’t know where, though family stories suggest the Douglasses originally came from Scotland). James married Letitia Joyce of Godalming on 20th May 1761 in Godalming, Surrey, and James is already described as watchmaker of Chertsey at this time. Letitia, born in 1733, was the daughter of Joshua Joyce (a baker and formerly Warden of Godalming) and Elizabeth (née Chitty) . James Douglass, 1765-1835 was their son. This James died at Chertsey in 1805. some of their clocks can be seen here>>>

James Douglas born 1827 Dumbarton, Dunbartonshire; by 1851 he was a Watchmaker & Engraver in Greencock, Renfrewshire. James died in 1878 in Colac, Victoria, Australia. A brother Thomas Napier Douglas born 1830 Dumbarton was a Watchmaker, Jeweller and Goldsmith in Greenock - he married (1) Agnes (Nancy) Buchanan Lamont & (2) Jessie Warden (nee Blair) Jones. Another brother John c1826 was a Watchmaker in Greenock and he died at c19 in 1845. They also had a sister Lilias who married Finlay Campbell a Grocer and Wine Merchant. Their father John Douglas 1794 Jedburgh, Roxburghshire was a Watch and Clock maker & Jeweller in Greenock by 1851.

It would be good if those researching these families could help bring them together!