On the face of it I can understand you feeling that the number of teeth/beads is insignificant ,as it shows little on the overall appearance of the coin , but that's not the whole story. Taking Pre-Decimal bronze pennies,[ my passion ], in the 107 years of mass production of circulation type dies, there were only 19 obverse, and 13 reverse pennies with differing numbers of teeth/beads. [as yet found] . Usually the number of teeth/beads changed with the changing of the image or font . But not always . In some years, notable 1860 1874 1908 1911 and others multiple changes were made to the number of teeth/beads with little change to the image or font. This would suggest that The Mint was trying out different dies for the next generation of pennies, and with only small amounts of them being released into circulation. It follows that most of the one year only tooth/bead die types are scarce or rare. This obviously is a minimal visual change, but significant in terms of the sequence of the dies used. These changes were deliberate ,and not made by error or chance, so must be part of the Historical sequence of die experimentation in coin production at the Mint. Terry