Nice find. I can tell you a bit about it. It is not 1920's, likely one of the later models with a corncob shank, my guess is 50's or 60's at the earliest. The 1920's version was much slimmer with a Bakelite or Redmanol stem. The stem on this pipe is nice and comfortable but it is going to be some other type of plastic than Bakelite.
After this style, the Bulldog was still made into the 70's and on special runs into the 80's but lost its corncob shank and really turned into a boring pipe.
This is probably one of the better pipes to smoke. It is from the crossroads when the quality of the corn was improved, and the quality of finish was still superb. You just can't match the burnished finish, at least they haven't since the good old days.
Assuming the pipe hasn't been in a musty attic for 5o years, or picked up some other unpleasant flavor, light her up.