As Steve says its all about the pics even that hang tag alone could be £50+ on ebay!
My rule of thumb is;
Battered with no case and a few slight modifications, unless the modifications are severe or parts missing £1200 minimum.
Nice condition with a few dings and a bit of mojo but all standard with some kind of vintage style case £1400-1700.
Very tidy all original with case £1700-1900.
Very tidy all original, teardrop MM case, 70's with epoxy preamp and strung thru etc £1900+
1976 with teardrop case in mint condition will crack the £3k if one ever comes on the market, never seen it happen yet, they have always had some kind of issue.
Lets see some pics, by mutes missing do you meen just the pads or have the actually spring plates and thumb turns been took off and lost?