Lifting it, it seems to weigh about that much (100+ lbs.) As I stated in the initial post, I'm sure on the 'BRISTOL' name; not so much on the 'ROYAL, though it does look very much like an 'R' at the beginning and an 'L' at the end of that first word. Btw, in the 2nd photo, the round item in the hole beneath the horn is a pipe or piece of conduit someone inserted (part of a 'handle', perhaps? . . . ) that looks like it'll come out fairly easily. Gonna try and post some photos . . .
A couple more. Not sure you can enlarge them enough to make out the stamping. I did a pencil rub on paper over them and they came out a little clearer. Will post those photos tomorrow if necessary. Appreciate the info provided, btw.