▶What is the difference between a watch movement and a watch case?
The movement is the mechanical or electronic heart of the watch: gears, springs, escapement, balance wheel, and jewels that work together to regulate and display time. The case is the housing: metal (steel, gold, titanium), crystal (glass), and caseback that protect the movement and hold it rigid. Watchmakers specialize in movements; case makers (horologers who work on cases) are related but separate. A movement swap (removing a damaged movement and installing a new one) is common repair; a case restoration (polishing, engraving repair, crystal replacement) is different work. Master watchmakers know movements intimately (can disassemble and reassemble a movement blindfolded, almost); case work requires different skills. Most independent watchmakers do both, but specialists exist.
▶How do I identify what type of watch movement I have?
Open the caseback (be careful not to damage the gasket seal). Look for visible markings: Swiss watches have 'Swiss' or 'Suisse' inscribed; Japanese movements have maker and caliber numbers. A 'Swiss 17 Jewels' movement is mechanical with 17 jewel bearings (17 is common for vintage). 'Automatic' means self-winding; 'Manual' means hand-wound. Write down the maker and caliber number (usually engraved on the movement plate). Search online for the movement's specifications: a Rolex Caliber 3135 is completely different from a vintage Omega Seamaster, and you must know which you have before attempting repair. Many watchmakers keep a library of service bulletins and drawings organized by caliber. Misidentifying the movement is a fatal error.
▶What is the main difference between automatic (self-winding) and manual (hand-wound) watches?
A manual watch requires the wearer to wind it by hand every day or two, pulling the crown outward and turning it clockwise to tighten the mainspring. An automatic watch winds itself via a weight (rotor) that swings as the wearer moves, transferring energy to the mainspring. Automatic watches have a rotor assembly; manual watches do not. Repair: automatics are more complex (extra parts = more to go wrong) but more convenient for the wearer. Some collectors prefer manual because it is more 'engaged' (the act of winding is meditative). Both types can be precise and reliable if serviced properly. A vintage manual watch serviced by a good watchmaker will keep time better than a neglected automatic.
▶What is an escapement and why is it critical?
An escapement is the mechanism that converts the continuous energy of the wound mainspring into precise regular 'ticks' that the balance wheel counts. The balance wheel (a wheel that oscillates back and forth at a precise frequency, like a pendulum) is the timekeeper; the escapement lets it free-swing, then catches and re-releases it. Common escapements: lever escapement (used in most mechanical watches), deadbeat (used in chronometers), and grasshopper (antique). A worn escapement (pallet stones chipped, lever worn, pivot bent) is one of the main reasons watches lose accuracy or stop working. Servicing an escapement requires removing the balance wheel, disassembling the escapement, cleaning and inspecting the tiny parts (under magnification), and reassembling with precision. One tiny chip in a pallet stone and the watch will not tick correctly.
▶How do I clean a watch movement without damaging components?
Old movements accumulate grime, dried oil, and dust that cause friction and wear. Cleaning: (1) Disassemble the movement completely, noting the order and orientation of each part (photography helps). (2) Use an ultrasonic cleaning machine with a mild solvent (synthetic watch cleaner, not harsh chemicals) to clean each part without hand-handling. (3) Dry completely with lint-free cloth or air (no heat). (4) Reassemble with fresh oil in each bearing (specified synthetic watch oil—not machine oil, not sewing machine oil). (5) Test the movement in the open before casing it. This process takes 6-10 hours for a complex movement. Mistakes: leaving a screw loose, using wrong oil (too thick = friction, too thin = wear), or missing a part during reassembly. Photography and labeling parts prevents errors.
▶What is a hairspring and why are they hard to repair?
A hairspring is an ultra-thin flat spiral spring that regulates the balance wheel's frequency—essentially a tuning device. In a watch rated for 28,800 vibrations per hour (8 Hz), the hairspring oscillates 14,400 times per minute. It is made of a special alloy (steel, Nivarox) and is incredibly delicate. Damage: a bent hairspring (common from drops or age) throws off timekeeping; a broken hairspring stops the watch. Repair: (1) Identify the problem (visual inspection under magnification). (2) If bent, attempt to straighten with a collet tool and tweezers (this is extremely difficult). (3) If broken, replacement is the only option—you must find a matching hairspring and install it, which requires disassembling the balance cock, removing the broken spring, installing new spring, and reassembling. This is expert-level work; many watchmakers send out hairspring work.
▶How do I test a watch for accuracy after service?
Timing test: (1) Set the watch to correct time. (2) Let it run for 24+ hours in a stable environment (minimize movement and temperature change). (3) Compare to a reference (your phone, atomic clock app). (4) Calculate the error: if the watch gained 5 seconds in 24 hours, it is +5 seconds per day. (5) Tolerance varies by watch type: vintage mechanicals might be ±20 seconds per day (acceptable); modern watches should be ±10 seconds or better. Rate change with position: flip the watch to different positions (face up, crown up, crown down) and retest—a good movement should run within 5 seconds of its rate in all positions. If rate is off, the movement needs adjustment (regulator adjustment or hairspring tweaking) by an experienced watchmaker. Do not declare a watch 'done' without thorough testing.
▶What is the typical cost and timeline for watch servicing?
A standard service (full disassembly, cleaning, reassembly, oil) on a common movement (ETA, Miyota): 8-15 hours, $300-600. A complex vintage movement (Patek Philippe, Longines): 20-40 hours, $800-2,000+. A damaged movement requiring parts replacement: add $200-1,000 depending on parts. These are rough estimates—each watch is unique. A customer should expect 3-8 weeks from drop-off to pick-up (depending on workload). Express service costs more and is not always advisable (rushing = mistakes). High-end watches (Rolex, Omega) may require factory service to maintain warranty; independent shops may be cheaper but have less access to replacement parts.
