Hello Simon. The bass you have is identical to mine which was my very first bass given to me by my parents for Christmas either 82 or 83 (memory fades). It was brand new and I have kept it ever since. It's my main practise guitar, although still use it on stage when necessary. It has been modded slightly with active meg's and Badass bridge. Love and it will never leave. In terms of value the previous posters are probably not too far off. A great guitar that has lasted well for over 40 years.
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