It first started trading in August 1945 and on its first day sold out of ice cream in two hours and made £48.
The Harbour Bar is now owned and run by Guilian Alonzi and his wife Theresa.
TAKE A LOOK: 32 pictures of the Harbour Bar as it prepares to celebrate is 75th anniversary here
1. Harbour Bar's 75th birthday
The new exterior serving area with Tori Dawson and a Covid-19 message.
It reads: "Our ice cream can be licked but not beaten by Covid-19"
2. Harbour Bar's 75th birthday
Owners Guilian and Theresa and Alonzi with staff in the Harbour Bar. The staff are wearing the familiar yellow and white uniforms
3. Harbour Bar's 75th birthday
Owners Theresa and Guilian Alonzi at the bar.
4. Harbour Bar's 75th anniversary
Guilian Alonzi at work in the factory at the back of the cafe