I was unexpectedly invited in to a neighbour's house today to give an opinion on a bass guitar, which I have brought home. He has had it 30 years and it has lived in his shed for the last 10. It is in pretty good condition, the finish is a bit crazed, some of the screws are a little rusty, but the neck looks straight. When he bought it he was told it was rare - fewer than 100 made. I had never heard of a 6 string Shergold marathon bass. The serial number is 7040, stamped on a metal pla