The ship yards of Treweek and William Thomas produced many vessels in the C19th. They started with the repair of sailing vessels such as the Hero but later built both wooden and steel sailing and steam ships.
Gaelic built at Amlwch port 1898
Mersey on stocks
Detlef Wagner 1891
Cenric on stocks 1905
Vessels built in Amlwch
| Built | Name | Tones | By | Rig | Brought | Owned by | Master/Fate/Notes |
| 1788 | Lovely | 76 | Brig | Capt William Botham | |||
| 1788 | Nancy | 15 | Sloop | Capt R.Griffiths | |||
| 1791 | Swallow | 7 | Sloop | ||||
| 1825 | Unity | 68 | N.Treweek | Sloop | 1825 | N.Treweek | Capt Robert Jones |
| 1826 | Marquis of Anglesey | 65 | N.Treweek | Sloop | 1826 | N.Treweek | Capt Hugh Thomas. . |
| 1827 | Margaret | 43 | N.Treweek | Sloop | 1827 | N.Treweek | Capt John Williams |
| 1829 | Eleanor | 17 | N.Treweek | Smack | 1829 | N.Treweek | Capt G.Jones |
| 1830 | James and Jane | 130 | Treweek Bros | B’ntine | 1830 | N.Treweek | Capt John Hughes |
| 1832 | Amlwch Packet | 37 | Treweek Bros | Smack/schooner? | 1832 | N.Treweek… T.Jones of Bangor | Capt Griffith Jones. Wrecked Abererch 14th October 1881 |
| 1834 | Sarah | 18 | Treweek Bros | Smack | 1834 | N.Treweek | Capt J.Jones |
| 1836 | Cymraes | 22 | Treweek Bros | Sloop | 1836 | N.Treweek | Capt Thomas Hughes |
| 1836 | Jane and Margaret | 56 | Treweek Bros | Sloop | 1832 | N.Treweek | Capt Wm Roberts |
| 1839 | Marianne | 53 | Treweek Bros | Sloop | 1839 | N.Treweek | Capt Thos Hughes |
| 1839 | Mary Owen | 53 | N.Treweek | Schnr | |||
| 1840 | Economy | 60 | Treweek Bros | Schn | 1840 | N.Treweek | Capt R.Jones. |
| 1842 | Catherine | 63 | N.Treeweek | Schooner | |||
| 1844 | Cymro | 20 | N.Treweek | Smack | 1844 | N.Treweek | Capt Owen Williams |
| 1844 | Cymro | 20 | Treweek | Schooner | 1863 | W.Thomas, Owen Owens, William Williams, foundary | Lost April 8th 1868 |
| 1858 | Alliance | 76 | Treweek & Co | Schooner | Palmer & Co | Capt T.Owen | |
| 1858 | Mary Catherine | 77 | Hughes & Co | I.Schnr | Jones& Co Amlwch | Capt J.German First iron ship built at Amlwch by William Thomas in 1858 on the western side of the port. The owners were Jones and Company, Amlwch. Captain John German. | |
| 1859 | Charles Edwin | 94 | Paynter | ||||
| 1859 | Grace Evans | 90 | Treweek & Co | I Schnr | N.Treweek, W.Thomas, Grace Evans, E.Morgan etc. | Capt J. Price The first two-masted iron schooner was launched from Treweeks yard in October 1859 with Nicolas Treweek ,William Thomas , Grace Evans and Edward Morgan,tobaconist each having ¼ share in her. | |
| 1862 | Sea Queen | 82 | Treweek & Co | Schooner | N.Treweek 40 | Lost Rhosneigr 1861 | |
| 1864 | Price of Wales | 99 | Iron Schooer | Captain Robert “Princess” | |||
| 1865 | Jane Gray | 124 | Paynter | Schooner | Sunk by enemy action 1915. | ||
| 1869 | Welsh Girl | 99 | Thomas | Schooner | 1870 | W.Thomas, W.Thomas, Liv | Capts. T.Jones, J.FarrellLost 21st March 1882 |
| 1870 | Lewis and Mary | 70 | Thomas | Schooner | 1870 | W.Thomas, E.Pritchard | Capt E.Pritchard. Sailed from Antwerp for Greenock in 1874 and was lost at sea. |
| 1871 | Charles | 48 | Paynter | For Charles Dyer the Parys mine agent. | |||
| 1872 | Holy Wath | 99 | Thomas | Schooner | 1872 | Morgan & Co Whitehaven 1875 | Built at Amlwch in 1872 by Captain Thomas for William Morgan of Cumberland. |
| 1874 | Cumberland Lassie | 208 | Thomas | Bgntine | 1874 | W.Postlethwaite | Capt P.Hodgson. For William Postethwaite of Cumberland. She was the largest ship yet built at Amlwch.( 1874) She carried coal to Dover for many years.Wrecked Start Point Jan 1918 |
| 1875 | Mersey (L’pool Pilot Boat no 11) | 79 | Thomas | Schooner | 1875 | Capt R.Williams. Sank near Bar Lightship Dec 2nd 1885 | |
| 1876 | Baron Hill | 209 | Thomas | Bgntine | 1876 | W.Postlethwaite | Capt J.Hughes A larger version of the Cumberland Lassie |
| 1876 | Lady Neave | 89 | Thomas | Schooner | 1876 | W.Thomas, W.Owen, I.Jones | Capt I.Jones. served in the coastal trade until sunk in a collision in July 1911 near South Stack. |
| 1877 | Nant Glyn | 103 | Thomas | wood Schooner | T.Jones and T.Jones | Lost all hands in October 1881. | |
| 1878 | Eilian Hill | 99 | Thomas | Schooner | 1878 | W.Thomas, L.Hughes etc | Built by Thomas with Charles Henry Hills as joint owner. In December 1882 she foundered off Penzance after colliding with SS Equist. |
| 1878 | Nesta | 104 | Thomas | Schooner | 1878 | S.R.Platt, Oldham | Capt J.Hughes. Sold in 1891 to W.Pritchard Portmadoc |
| 1879 | Glyndwr | 26 | Thomas | Smack | 1879 | W.Thomas | Capt W.Williams. Lengthened 1882.she carried various cargos alone the North Wales Coast. Went ashore near Point Lynas may 1883. Wrecked near Hoylake 9/1/1886. |
| 1879 | Margaret | 72 | Thomas | Schooner | 1879 | W.Thomas | Capt J.Thomas |
| 1880 | Pearl | 100 | Thomas | Schooner | 1880 | T.Fanning Evans | Capt W.Lewis. Sold to Conah’s Quay 1890 |
| 1881 | President Garfield | 48 | Thomas | Schooner | 1881 | W.Thomas jnr | Sold in 1897 to Cornish owners. |
| 1883 | W.S.Caine | 74 | Thomas | I.Dandy Stmr | 1883 | W.Thomas, then W.Thomas Liv then Manchester, Liverpool and N.Wales SS.Co | Capt L.Thomas First Iron screw steamer to be built at Amlwch by Thomas she was 180 tonnes and was built for a contract price of £5000 in 1883. |
| 1884 | Anglesey | 158 | Thomas | Ketch | Small iron screw | ||
| 1884 | Exchange | 292 | Thomas | I.stmr | 1884 | W.Thomas & Co, Liv | Capt A.Grant. Captain Thomas Davies in 1900. |
| 1885 | Anglesea | 149 | Thomas | I.stmr | 1885 | W.Thomas. L.Thomas, Bilbao owners in 1894 | Capt W.Gibbon |
| 1885 | Camborne | 108 | W.Cox -Paynter | 3 Schnr | Capt T.Morgan. | 1914? Sold to Swansea. (Hugh Shaw tells story in “Schooner Captain”) | |
| 1885 | Elizabeth Peers | 183 | Thomas | I.Schnr | 1885 | W.Postlethwaite | Capt E.J.Peers |
| 1887 | Gelert | 223 | Thomas | I.Schnr | 1887 | W.Thomas, L.Thomas | Wrecked Catalinita Is 26th April 1890. |
| 1889 | Eilian | 116 | Thomas | Schooner | 1889 | W.Thomas & Sons, R.Griffiths | Sank 6th July 1899 after a collision with SS Afrique off St Catherines Point. |
| 1890 | Prince Ja Ja | 271 | Thomas | S. Screw 3 mast | 1890 | Liverpool and Menai Strait SS co Ltd | Capt J.Richardson Spent many years in the Menai Straits carrying miscellaneous goods for shop keepers. |
| 1891 | Cygnus | 355 | Thomas | I.Screw Stm | 1891 | R.J.Francis and A.Evans | Capt J.T.Francis |
| 1891 | Detlef Wagner | 225 | Thomas | I.Screw Bkn | 1891 | H.Baumann | A well known European vessel. She was sunk by a submarine in 1917. She was named after her owner, a ship broker in Hamburg. |
| 1892 | Ailsie | 98 | Paynter | 3 Schnr | Platts of Oldham | Capt John Hughes. Managers at Llanfairfechan | |
| 1892 | Maggie Williams | 226 | Thomas | I.Schnr | 1892 | W.Postlethwaite | Capt W.Williams |
| 1893 | Cymric | 226 | Thomas | I.Bkn | 1893 | W.Thomas & Sons | Capt R.Jones |
| 1894 | Celtic | 224 | Thomas | I.Schnr | 1894 | W.Thomas & Sons, W.Renney Conahs Quay | Capt J.Hughes |
| 1898 | Gaelic | 224 | Thomas | I.Bkn | 1898 | W.Thomas Jnr, L.Thomas, J.Williams | Capt I.Williams. Sold to Conah’s Quay 1920 |
| 1904 | Becca & mary | Hugh Jones | for the Duddon Shipbuilding company in 1904. | ||||
| 1904 | Elizabeth Roberts | 134 | Thomas | S.Schnr | 1904 | E.O.Roberts Liverpool | Capt E.A.Nielson |
| 1904 | Meyric | 253 | Thomas | S.Schnr | 1904 | W.Thomas & Sons | Capt W.B.Williams |
| 1905 | Cenric | Thomas | Steel Schooner | W.Thomas & Sons | Capt M.Parry. Not heard of since leaving Twillingate Nfl 1906 | ||
| 1908 | Eilian | 140 | Thomas | S.Schnr, aux | 1908 | W.Thomas & Sons | Capt H.Hughes |
| Donald and Doris | Paynter | Schooner | Hodborrow Mining Co | Capts Wynn and Jones.For the Hodbarrow mining company. | |||
| Eilianus | Thomas | Steam vessel wrecked off Cornish coast. |