Have you considered another stock for the gun? Have that engraved and refinish that. The engraving will not only change the value of the original stock, but the engraving will also hide the beautiful wood, usually. Since the gun has no real sentimental value, it makes no difference to the stock that none of the other family members handled it. If you must do it to this gun, also consider getting a different butt plate and having that engraved, instead of the original wood or butt plate. JMHO