How much do you think this is worth

this is a ibanez roadster bass series 2, from 1983 (ish), it was bought for £150, now because of inflation, that is £300. That is how much it costs, but not what its worth, i was just wondering, rather like a penny black is only 1p, but is worth chuck loads more. It has it's original strings, and there are no dents in it. Perfect codition. Can anyone help