BillHead receipts were common in business transactions from the late 1860s through the early 1940s... and in some cases, they can be found in present day transactions (although it is a less common practice now.)
Many billhead receipts were illustrated and decorated with fancy steel engravings, while others carried no illustrations... in either case the receipt itself was important, as it was your proof of delivery. In general, most billheads contained: The Company Name & Address, A Unique Invoice Number, Payment Terms, Line Items for Products or Services, A Total, and (optionally) handwritten notes.