B&M Brick Oven Baked Beans
B&M was founded in 1867 by George Burnham and Charles S. Morrill. I'm going to guess back then the abbreviation, BM, wasn't equated with bowel movement, bad mannered, birthmother, breast milk, bone marrow or Bashir Mirza.
B&M also offered other canned products like roast beef, mutton, pork, lamb, roast chicken, roast turkey, carrots, turnips, corn, herring, clams and lobsters. B&M seems to pretty much concentrate on canned baked beans now.
(the photo is a drive-by shooting)
Portland, Maine 2014