John Hamilton (2)
NB need to check whether these references are all the same John Hamilton
1862 Robert Duncan, Junior decided to strike out on his own. With John McGregor and John Hamilton and using his father's company name, he took over the East Yard in Port Glasgow from John Reid and Co.
1870 Retired from Robert Duncan and Co
1877 John Hamilton, James Hamilton and Alexander Carnegie Kirk purchased the shipyard and engine works of Robert Napier and Sons for the sum of £270,000 and carried on the business under the old title[1].
1910 Partner in Robert Napier and Sons[2]