I have a 12 Gauge made in 1920 by Holland and Holland/England. I inherited from a friend who died. I had it totally re-conditioned (stock plus recoil pad and new ejectors--otherwise it's mint original.) Top few inches is rifled for slugs or lead shells (like a nitro express I suppose) Has fold down 50, 100, 150 yard sights. Scroll work is silver with gold inlay for the word "safety", and a few other spots. It's presently stored or I'd post pictures. How would one find the value of such a shotgun. (P.S.--H&H confirmed mfctr. date from the serial number-London Gunroom)