Probably the best bet is to fight the temptation to completely refinish a nice old collectible bow.
There is a slipperly slope to avoid that begins with innocent polishing and then tempts some of the less scrupulous to commit calculated fraud.
Who knows how serious the stress lines were when covered with Loctite, Smooth-on epoxy, a layer of paint that matches the original fiberglass, and a dazzling new coat of Fullerplast?
How tempting must it be for a refinisher to add a nifty signature or doodle when he has already expertly forged the serial number, draw weight, and AMO?
Let your conscience be your guide - but without documentation, buyer beware. If it looks too good to be true, it probably isn't.