Many neighborhood market owners trusted their regular customers enough to let them buy "on credit." How did small market owners keep track of what they were owed by customers who didn't have enough money to pay for their groceries in full?
Before there were "charge cards," there were account books. This book is from Evans' Market, one of the many small mom and pop markets that once were found in just about every Ambridge neighborhood.
312 First St.
owned by Bob Mikush
Note the "Amb. 6" phone number.