Advice on gold audemar piguet watch please

[Rny]

Hello,
newbie here. I'm hoping some one may be able to help. I inherited from my dad a Audemar Piguet gold bracelet watch (attached pics).

I remember it from the seventys when my dad would shake it to wind it up. It's now just left in a draw at home so I've decided to sell. Not sure of it's value or where best to sell it. I took it to a local gold merchant geezer who offered me 700 quid but thought it would be best to seek further expert opinions. Any advice I really would be grateful for.

Thanks in advance.