Info on some lap steels.

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A friend of mine is retiring due to health problems and has a number of lap steels which he would like to get an idea of what they may be worth as he is considering selling up. First up is an all aluminium Rickenbacker twin 8 currently tuned to E13 and C6 and comes complete with stand. Next is a strange one it's a 7 string Rickenbacker tuned to G6. Next is a 6 string Rickenbacker (my favourite one) an d finally this is a British made Premiervox 6 string which comes with a built in valve amp in the case, this one really needs a new nut but plays ok. If anyone can help with valuations it would be very much appreciated. It is his intention to sell them but would like to know their worth before making up his mind. Thanks for looking.