As the others said, its a Drummond B. I have the Admiralty version of the same machine, a B.S with proper apron and power cross feed, they are pretty capable machines for their age. Much more sturdily built than my other machine, a Drummond 'pre-A' flatbed from 1904 which has the same overall form but much more lightly constructed.
The number on mine is out on the tailstock end of the bed somewhere.
Are you planning to keep it and use it - I hope so, nothing like using a family heirloom
