What size were Baker's Chocolate bars when they were first introduced?

Question

I have a recipe from my grandmother that calls for a bar of Baker's Chocolate. What size (weight) were these bars made by Baker's Chocolates when they were first introduced?

Answer 1

Bakers Chocolate Bars prior to mid 2013 were 8 ounce bars, after mid 2013 they became a 4 ounce bar.