A herringbone gear, a specific type of double helical gear, is a special type of gear that is a side to side (not face to face) combination of two helical gears of opposite hands.
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Check out the below image examples of locating the dell serial number and other details like date of manufacturing and place of manufacturing and the PPID for two different models. For you information, dell serial Number is a 20 digit PPID number on the label to verify the manufacture date. The above monitor(dell s2209w and s2409w and other dell monitors) has the bar code serial number located at the back which can be viewd by just turning the monitor around.