Hi John, Although I have no hesitation in breaking an incomplete and too expensive to finish gun, or one that is badly damaged, this one was quite a rarity IMHO with those combinations of markings, so would have been a 'saver' if mine.
A retail mark alone can bring bring a small premium in value, but to have the National service league, and the gun number on the pistol grip bottom as well as a Top retailer made this probably 1 of a tiny handful with this combination.
As you say, a shame, but presumably several other guns have been brought back to working order with the various "body parts"!