no idea what yours is,but the "good" "brand new" fake Chinese gibbo`s start at around $250 .. going up to around $350 .. i only looked at "standard" types at a resellers site ... will be much cheaper from the manufacturer ...
at $650 there is good profit in it,for him (unless he's already been stung) ... few months ago on ebay a uk guy sold off his chibson collection,had about 12 of these things,swapped out pickups n pro setups .. they went for £125 to around £250 ...
it might be a great sounding player .. imo at $150 its worth a look