My grandfather and Dad both used horses in farming, although Dad had tractors later. One thing that sticks in my mind from those days, are the
celluloid decorations on the horses harnesses..
Many farmers and loggers used them...and this celliuloid heart, was VERY popular.
Foremost, must be the celluloid heart that the reins (lines) were strung through a ring (about 3"), between the horses,. Below see photo off the web,
ahowing the celluloid heart and an accompanying photo, showing how it is used.