THALASSA OWNERSHIP
| 1903 | Keel laid by Sibbick |
| 1906 | Completed by Fay of Southampton |
| 1908 | H Wilford of Ryde, Isle of Wight |
| 1909/11 | I Swinnerton Dyer of Craven Arms, Salop |
| 1912/18 | S Garrett of Marylebone, London W1 |
| 1919/20 | Capt H C and Mr C B Game of Broadway, Worcs |
| 1921/23 | F Wilmot-Sitwell of Beaulieu, Hants |
| 1921 | First Engine Fitted. 2 cy 4"-5" Atlantic Engine Co, Wishaw |
| 1924/25 | Lieut-Colonel Hawkes of Crosshaven, Ireland |
| 1926/29 | J C Ponsonby of Lymington, Hants |
| 1929 | Engine Fitted 2 cy 31/2"- 41/2" Thorneycroft |
| 1930/33 | A Rosling of Weybridge, Surrey |
| 1934/35 | G Napier-Martin of Havant, Hants |
| 1934 | Engine Fitted 4cy 21/2"-4" Parsons. Also Electric Light |
| 1936/66 | Alan Bostock Baker of West Mersea, Essex |
| 1967/ | Richard and Vivian (3rd Daughter of Alan Baker) Sewell of Dun Laoghaire and then London |