According to the ‘Lifeboat Enthusiasts Handbook’ ON847 “Gertrude” was a 46′ Watson class lifeboat, built in 1945.
She saw service at the following stations:
Holy Island: 46-68
Exmouth: 68-70
Sheerness: 70-74
Relief: 74-80
Fowey: 80-81
Fowey was her last posting, before she retired in 1981. She has been in private ownership in Mevagissey ever since.