Teddy Baldassarre
Mechanical vs. Automatic Watch Movements Explained
Among the many questions a novice watch enthusiast is faced with, “Mechanical vs. Automatic Movement?” is one of the most basic, yet one whose answer is a bit more complex than a simple A-or-B explanation. In fact, “mechanical or automatic” isn’t even really framing the choice correctly. In the article below, we attempt to clarify the subject and answer the most pressing questions about these tiny engines inside your watch. What is a Mechanical Movement? A mechanical movement, like the Nomos DUW caliber below, uses a coiled metal spring, called a mainspring, that releases energy as it uncoils through a series of gears to drive a weighted, oscillating wheel called a balance wheel. The balance wheel’s oscillations are linked to an escapement, which periodically releases the gear train to move the hands forward to record the passing of hours, minutes, and seconds. In short, a mechanical movement in a watch is any type of movement that uses no batteries or electronic components to function - which makes them different from more modern inventions, like quartz, Spring Drive, and solar movements. Technical developments over the centuries are what led to the two types of mechanical movements we’re discussing here. Originally, the movement’s mainspring needed to be wound periodically by hand - first by a key, then by a small knob called a crown that was attached via a stem to the movement. Later, a type of movement was developed that could be wound “automatica...
