Barnard laid her keel that very day and built her to a design by the Surveyor of the Navy Jacob Acworth.

[1] Seahorse was back in the English Channel in 1752, with Hugh Palliser replacing Barrington in April 1753.

[1] Seahorse then served initially in Home waters, before sailing to North America in January 1755.

Seahorse then left for North America on 14 February 1759, and spent the rest of the year at Quebec.

Captain Robert Jocelyn took command in 1763, after which Seahorse returned to England and was paid off in June 1763.

Early on the morning of 10 August 1778, Admiral Edward Vernon's squadron, consisting of Rippon (Vernon's flagship), Coventry, Seahorse, Cormorant, and the East India Company's ship Valentine, encountered a French squadron under Admiral François l'Ollivier de Tronjoly that consisted of the 64-gun ship of the line Brillant, the frigate Pourvoyeuse and three smaller ships, Sartine, Lawriston, and Brisson.

Sartine had been patrolling off Pondichery with Pourvoyeuse when they sighted two East Indiamen, which were sailing blithely along, unaware of the outbreak of war.

Captain Robert Montagu took over command in March 1781, and under him Seahorse was present at the battles of Sadras on 17 February 1782, Providien on 12 April, Negapatam on 6 July, Trincomalee on 3 September, and Cuddalore on 20 June 1783.

[1] After Richard Buller purchased Seahorse, he had Randall, Gray and Brent, of Rotherhithe rebuild her as an East Indiaman, and renamed her Ravensworth.

Ravensworth reached Johanna on 27 July and Madras on 24 August, before arriving at Calcutta on 12 September.

She reached the Cape on 29 December and St Helena on 28 January 1788, before arriving at the Downs on 30 March.

[2] On her return Buller sold Ravensworth to C. Herries & Co. Lloyd's Register for 1789 gives her master's name as "Drumond", and her trade as Cork-"l'ornt".

[10] The entries in Lloyd's Register continue essentially unchanged through 1793, though with her trade changing to London-"L'Ort", or Liverpool-"L'Ornt" (probably Lorient).

[12] Another source states that the French vessel was the frigate Citoyen, and that she had ransomed Courier for £300 from her captain.

The report also stated that Citoyen had lost her captain and 63 men killed in an engagement with a British frigate and was under the command of her first lieutenant, an American.